Anybody on here have a custom exhaust with the stock muffler still? I'm trying to see what type of gains you had if so? I like the look/ sound of the stock muffler and I'm obviously not looking to make crazy power with the car, but would be nice to let it breathe a little better. Only things that I don't like is I feel like I would have a nice open exhaust and then have it tapper back down to go threw the stock muffler. Thoughts/ opinions?
Anyone have a custom exhaust/ stock muffler?
- Thread starter mxjosh82
- Start date
I went to a local hole in the wall exhaust shop, had a 3" stainless exhaust done with a magnaflow muffler and welded on the stock MSP tip. $275 and 1 hour later I was out the door with new muffler and exhaust. I've never been a fan of magnaflow as it reminds me of big jacked up trucks, but I made a deal with the guy...if it sounds like s***, I get the work done for $50 but damn I've never had so many compliments on just an exhaust tone before.
If you get a bigger exhaust but keep the stock muffler you'll be going from small to big to small, if anything get a bigger exhaust, muffler, and keep the tip since it looks much better than most upgraded exhausts.
If you get a bigger exhaust but keep the stock muffler you'll be going from small to big to small, if anything get a bigger exhaust, muffler, and keep the tip since it looks much better than most upgraded exhausts.
Right, thats what I was thinking is that it was going to be going small big small and didn't want, but like I said I like the look of the stock muffler. Could you tell a performance difference? I've heard of boost slightly increasing just from a better exhaust. Do you have a stock or aftermarket down pipe?
For the time being my DP is stock. I did notice a change, the car feels healthier ( if that makes sense ) and acceleration seems to have picked up. I can really hear the turbo now, it screams.
I took out cats/ resonators so sometimes when I downshift I can hear a gurgle gurgle noise which is pretty interesting.
I took out cats/ resonators so sometimes when I downshift I can hear a gurgle gurgle noise which is pretty interesting.
Spiced MSP
Member
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- 2016 Peterbilt 579
sort of like the SRT4 gurgle? lol, mine does it too, but definitely not as pronounced as the srt
Where was your custom exhaust bolted to? the J pipe?
I had a magnaflow muffler on my MX6 and it sounded great, tons of complements and no drone. Another C6 owner swapped his stock cans for magnaflow cans and they also sound great. I have yet to hear a magnaflow system that doesn't sound good. When I think of those awful sounding trucks, I think of Flowmaster.
$275 is a decent price. When I was planning on getting Pope's dp, I got a quote for doing the DP back in 3" using a high flow cat, maganflow cat and muffler in a stock config, and he said it would run about $700. I told the guy I wanted it as quiet as we could get it, and he said that would be as quiet as a 3" exhaust could be.
3" is clearly overkill for the MSP since most flow calculators don't have it causing any restriction until 450hp, but there is nothing wrong with a little overkill.
A 2.5" I think would be about perfect, and I was close to pulling the trigger on the reproduction Corksport DP, but I just couldn't justify the $1100 the whole thing would cost me on a very old car that has other more important shortcomings to solve first.
I was told by a number of people that the primary restriction in our exhaust was our double catted mid pipe, so I bought a catted SLS instead, which was a huge mistake. It did absolutely nothing and since I was unsuccessful in finding the two piece Corksport, I just ended up selling it at a significant loss even though it was on the car for just a few miles.
From that experience, or even just by looking at the pipes, I am fairly certain there is nothing to be gained unless you start a the downpipe and work your way back. The S and J pipe diameter are alarmingly small when you have them off the car, well under 2". Putting anything larger beyond that without addressing that first seems like a waste.
$275 is a decent price. When I was planning on getting Pope's dp, I got a quote for doing the DP back in 3" using a high flow cat, maganflow cat and muffler in a stock config, and he said it would run about $700. I told the guy I wanted it as quiet as we could get it, and he said that would be as quiet as a 3" exhaust could be.
3" is clearly overkill for the MSP since most flow calculators don't have it causing any restriction until 450hp, but there is nothing wrong with a little overkill.
A 2.5" I think would be about perfect, and I was close to pulling the trigger on the reproduction Corksport DP, but I just couldn't justify the $1100 the whole thing would cost me on a very old car that has other more important shortcomings to solve first.
I was told by a number of people that the primary restriction in our exhaust was our double catted mid pipe, so I bought a catted SLS instead, which was a huge mistake. It did absolutely nothing and since I was unsuccessful in finding the two piece Corksport, I just ended up selling it at a significant loss even though it was on the car for just a few miles.
From that experience, or even just by looking at the pipes, I am fairly certain there is nothing to be gained unless you start a the downpipe and work your way back. The S and J pipe diameter are alarmingly small when you have them off the car, well under 2". Putting anything larger beyond that without addressing that first seems like a waste.
Exactly.
Yup.
Agreed. The S & J pipes are ridiculously and embarrassingly small/restrictive.
I doubt I gained a large amount of power (I took off all cats/resonators), I haven't put it on a dyno, I do feel as though there was a small amount of power freed up. My girlfriend sometimes takes the MSP out (she can't tell a tire from a remote control) and mentioned that it seemed to "speed up quicker". I asked her if it sounded different because I re did the exhaust. She says...You did? She was oblivious.
*doh!
haha
I used a mounted phone using a 1/4 mile app. It was the exact same temp and weather on back to back days. Stock vs SLS mid pipe. The butt dyno thought I gained a little bit too, but the phone had the exact same trap speed down to the tenth of a mile per hour. It was in the middle of summer last year so maybe cooler denser air would have resulted in more horsepower and therefore a larger gain. But 2x of nothing is still nothing.
