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Test pipe and MS3
- Thread starter LV_MS3
- Start date
well I figured it needed taken off to do it, but will the catalyst come out fairly easy or is it a pain in the ass I imagine there is hard to reach spots where there will be pieces remaining.
you probably could have gotten some money from recyclers for the guts of the cat if I do this I probably will
I would imagine if any of the catalyst is in a spot that cannot be easily removed, then it won;t be impeding the flow of exhaust anyway.
When it comes out, does it come out in large chunks, or small pieces? I was thinking about attaching my shop vac hose to one end to suck out all the crap so I don't breath it in.
as far as smogging. In California they put a little thing in the back of your exhaust tip that looks like a crooked metal thing and there is a hose attatched. so even tho there is no o2 sensor on or behind the second cat I would think it would still not pass a smog check because the thing in the back is reading the exhaust fumes and I would think that it would show up being pretty bad since there is nothing filtering the exhaust. I could be wrong
But isnt a test pipe a bigger pipe diameter as well? so putting on a test pipe as opposed to gutting the cat would still be better right?
clos561 did you notice some substantial power increas when you gutted yours?
But isnt a test pipe a bigger pipe diameter as well? so putting on a test pipe as opposed to gutting the cat would still be better right?
clos561 did you notice some substantial power increas when you gutted yours?
as far as smogging. In California they put a little thing in the back of your exhaust tip that looks like a crooked metal thing and there is a hose attatched. so even tho there is no o2 sensor on or behind the second cat I would think it would still not pass a smog check because the thing in the back is reading the exhaust fumes and I would think that it would show up being pretty bad since there is nothing filtering the exhaust. I could be wrong
There is still a cat in the DP.
I would imagine if any of the catalyst is in a spot that cannot be easily removed, then it won;t be impeding the flow of exhaust anyway.
When it comes out, does it come out in large chunks, or small pieces? I was thinking about attaching my shop vac hose to one end to suck out all the crap so I don't breath it in.
if there is pieces remaining they may come loose, and clog the resonator or muffler I would want to be sure there is nothing left
good point I'll bet that 3" SLS piece is an improvement over a gutted cat, and to offset the cost you could probably get $100 for recycling the cat. still I would like to see dyno results of both on an unmodified caras far as smogging. In California they put a little thing in the back of your exhaust tip that looks like a crooked metal thing and there is a hose attatched. so even tho there is no o2 sensor on or behind the second cat I would think it would still not pass a smog check because the thing in the back is reading the exhaust fumes and I would think that it would show up being pretty bad since there is nothing filtering the exhaust. I could be wrong
But isnt a test pipe a bigger pipe diameter as well? so putting on a test pipe as opposed to gutting the cat would still be better right?
clos561 did you notice some substantial power increas when you gutted yours?
if there is pieces remaining they may come loose, and clog the resonator or muffler I would want to be sure there is nothing left
good point I'll bet that 3" SLS piece is an improvement over a gutted cat, and to offset the cost you could probably get $100 for recycling the cat. still I would like to see dyno results of both on an unmodified car
I am wondering if gutting the cat really gives you any gains as opposed to buying say the turbo xs piece which is only like $140. If the stock pipe there is only 2.25 inch or whatever I would assume the 3-inch would be better to go with. But unless you replace the exhaust itselt you would get the bottleneck effect of a larger diameter testpipe and smalled diameter back exhaust. So to me it seems like gutting is the best option. Just wiondering if anyone has noticed real gaimns from it.
if it is possible to get 10-25hp ATW thats freakin insane! That would have to be from replacing the DP, I couldnt imagien getting that much from simply gutting a cat!
I am wondering if gutting the cat really gives you any gains as opposed to buying say the turbo xs piece which is only like $140. If the stock pipe there is only 2.25 inch or whatever I would assume the 3-inch would be better to go with. But unless you replace the exhaust itselt you would get the bottleneck effect of a larger diameter testpipe and smalled diameter back exhaust. So to me it seems like gutting is the best option. Just wiondering if anyone has noticed real gaimns from it.
if it is possible to get 10-25hp ATW thats freakin insane! That would have to be from replacing the DP, I couldnt imagien getting that much from simply gutting a cat!
The further donwstream the reduction is the better, so a test pipe will be marginally better than gutting the cat. I also imagine a straight pipe flows better than a gutted cat.
I do believe the gains you mentioned can come just from a test pipe. CS claims 25-35 WHP, so figure 15-25 in the real world.
The further donwstream the reduction is the better, so a test pipe will be marginally better than gutting the cat. I also imagine a straight pipe flows better than a gutted cat.
I do believe the gains you mentioned can come just from a test pipe. CS claims 25-35 WHP, so figure 15-25 in the real world.
how about on a gutted cat? possibly 10-20whp in that range? Any loss or torque gain?
I remember putting a dp and cat delete on my gst eclipse years ago and holy s*** that made the turbo whine like crazy and gave a serious boost in hp!
test pipe is nice, but if the test pipe is 3inch and the rest of the catback is 2.25 inch or w/e the stock is, it will jsut bottle neck and you wont have THAt much of a difference. staying with the stock gutted cat keeps things similar in size and of course, its free....i cant see how you would be able to recycle the cat and get 100 dollars to be honest. i had a small pile of s*** that came out of the pipe which had some chunks but was mainly powder and very small pieces of the cat.
The further donwstream the reduction is the better, so a test pipe will be marginally better than gutting the cat. I also imagine a straight pipe flows better than a gutted cat.
I do believe the gains you mentioned can come just from a test pipe. CS claims 25-35 WHP, so figure 15-25 in the real world.
I don't think you realise the test pipe replaces the SECOND cat, there is still a cat in the down pipe. The sensors only monitor the primary cat (in the dp) so deleting/gutting the second cat yields no cel.
I don't think you realise the test pipe replaces the SECOND cat, there is still a cat in the down pipe. The sensors only monitor the primary cat (in the dp) so deleting/gutting the second cat yields no cel.
There is still a cat in the DP.
Certainly looks to me like I realize it.
I don't think you realise the test pipe replaces the SECOND cat, there is still a cat in the down pipe. The sensors only monitor the primary cat (in the dp) so deleting/gutting the second cat yields no cel.
do you think gutting the second cat will give pretty close to the same results hp/tq gain wise as putting on a testpipe? If so I'll just do that and keep it "looking" stock so you dont have to take it off when going to a dealership.
Since it would not possibly effect me in a negative way, I dont see why saving $150+ on the test pipe would be such a bad idea if I can still get sound and gains from gutting the cat
do you think gutting the second cat will give pretty close to the same results hp/tq gain wise as putting on a testpipe? If so I'll just do that and keep it "looking" stock so you dont have to take it off when going to a dealership.
Since it would not possibly effect me in a negative way, I dont see why saving $150+ on the test pipe would be such a bad idea if I can still get sound and gains from gutting the cat
I think you'll get similar, albeit slightly lower, gains from gutting as opposed to a test pipe. The better flow of the test pipe and moving the bottle neck downstream slightly will be a little better than gutting the cat. That said, I think I will be gutting my cat and putting the test pipe purchase I was planning on hold. My only concern is the possibility of moving to a state that does real emission testing. My home state of MA does, so if I ever move back, I might have to replace the stock midpipe, which is much more expensive than a test pipe. Decisions, decisions, decisions....
Any people out there in CA gutted there cart and been fine with it? I know it will look stock but as i mentioned before they put the exhauist fune thing in the muffler tip and I wasn't sure if they would come up not passing due to not having that second cat to clean the fumes more.
Any people out there in CA gutted there cart and been fine with it? I know it will look stock but as i mentioned before they put the exhauist fune thing in the muffler tip and I wasn't sure if they would come up not passing due to not having that second cat to clean the fumes more.
That's the benefit of the test pipe, you're only 30 minutes from stock.
Quit being indecisive and install the dp and rp!! Reverting back to the the factory dp and rp for a dealership visit wouldn't take that long, besides (knock on wood) the MS3 has proven to be pretty reliable
One thing I won't be doing is going catless. If I replace the DP it will be the CP-E catted DP. But that's an awful lot of money. I think a test pipe is in my future.
Going catless really isn't a big deal, purchase an O2 extender for a couple bucks from your local performance shop before you do the install or order one online. Install it into the second O2 bung on the DP and voila no CEL's. I had CEL's before i tried this from not having any cats but afterwards(2,000 miles) i haven't had any. Besides the CP-E catted DP has not eliminated thrown CEL's entirely. In my opinion the best quality:money combo would be CS rp & turbo Xs DP.
Going catless really isn't a big deal, purchase an O2 extender for a couple bucks from your local performance shop before you do the install or order one online. Install it into the second O2 bung on the DP and voila no CEL's. I had CEL's before i tried this from not having any cats but afterwards(2,000 miles) i haven't had any. Besides the CP-E catted DP has not eliminated thrown CEL's entirely. In my opinion the best quality:money combo would be CS rp & turbo Xs DP.
I'm not concerned with CEL's, but rather the environment and the gas smell you can get sans cat.
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