sp2 and downpipe

[speedmo21]

so i think im leanin towards the greddy sp2 catback system..im gonna get a catless downpipe also...would it make a difference if i went w/a 2.5 or a 3.0 inch downpipe? like if i got a piece to connect the 3" dp to the sp2 would it be worht it??

 

[Titanium]

just get the 2.5. For one you aren't making enough power to even need a 3" pipe and two it would be pointless if you are then down stepping the pipe to a 2.5. Save your time and money and get the 2.5 with the greddy and you will be very happy with the turn out.

 

[jsahyoun]

i have this setup on my mp3 (msp turbo). it sounds and looks great, not to loud at all. I recommend it.

 

[daedalus]

I have a 3" GHL downpipe with a 2.5" connector, to my 2.5" JIC SUS Exhaust. There are gains with the 3" dp over a 2.5" and it isnt useless. In my opinion this setup will have the best combination of deep sound, great flow, and sexy look.

Keep in mind that catbacks on our cars dont do much. In fact, the dyno with the SP2 exhaust on a stock MSP made like 0whp gains. The downpipe is where the gains are at so go as big as you can (aka 3"). Who cares whats bolted up to it... it wont make two s**** of a difference.

 

[Swerny]

There are gains with the 3" dp over a 2.5" and it isnt useless. In my opinion this setup will have the best combination of deep sound, great flow, and sexy look.

The GHL DP is different from all the others as it replaces the S-pipe, so for sure there will be a difference.

Keep in mind that catbacks on our cars dont do much. In fact, the dyno with the SP2 exhaust on a stock MSP made like 0whp gains. The downpipe is where the gains are at so go as big as you can (aka 3"). Who cares whats bolted up to it... it wont make two s**** of a difference.

I keep seeing people quote that and have never seen the actual link. I'm starting to think it's an urban legend.
I have the 2nd generation SP2 (1 resonator) and there is a noticeable power gain, especially at the top end compared to stock.
I actually dumped the 3 inch I had for a week to go back to the Greddy.
It sounds awesome with my catted midpipe.

 

[CasopoliS]

I have the 2.5" Apex DP with high flow cat and the sp-2 exhaust. I love it. If you get a good deal on a 3" just get it.... other than that you will be fine with either size.

 

[speedmo21]

ya i know the dps really give u the horse thats y i wanted to go w/the 3inch DP...who makes a good 3 inch catless downpipe for a decent amount of $$ .. i know apexi has the 3inch for like 330

 

[NeverSober]

I got my apex 3 inch catless, for $200 shipped.....I would go with a full 3 inch....especially if you have future plans for the car. You will spend mroe nwo gettin the 2.5 then later wanting the 3 inch. And you will be liek damn it, why didnt I listen to NeverSober, woulda saved myself some time and money..........haha

Just wait a little while, if you can and I am sure some downpipes will be up forsale....it always happens on here.....


Chris

 

[Titanium]

pipe size should really depend on what kind of power you plan on getting out of the motor. Read up on pipe sizing with forced induction and you will see that 2.5 will be a great size for a stock short block power levels will ever be able to handle. Unless you plan on getting 300+ whp out of your car then don't worry about the 3" piping. But go ahead and listen to all the guys that bought 3" piping cause they didnt just buy it cause they heard the bigger the better with force induction.(still anyways applies to the application)

 

[CustomMSP]

pipe size should really depend on what kind of power you plan on getting out of the motor. Read up on pipe sizing with forced induction and you will see that 2.5 will be a great size for a stock short block power levels will ever be able to handle. Unless you plan on getting 300+ whp out of your car then don't worry about the 3" piping. But go ahead and listen to all the guys that bought 3" piping cause they didnt just buy it cause they heard the bigger the better with force induction.(still anyways applies to the application)

Very good point. Plus the stock S-pipe is only 2" at most.

 

[msp35]

pipe size should really depend on what kind of power you plan on getting out of the motor. Read up on pipe sizing with forced induction and you will see that 2.5 will be a great size for a stock short block power levels will ever be able to handle. Unless you plan on getting 300+ whp out of your car then don't worry about the 3" piping. But go ahead and listen to all the guys that bought 3" piping cause they didnt just buy it cause they heard the bigger the better with force induction.(still anyways applies to the application)

I wish I had the link that simply disproves this, but alas, I cannot find it. So I'll just say bigger is better, bash if you want. So anyways, the explanaition went basicaly like this...."backpressure good for N/A, bad for FI (PERIOD). I lucked out and found a GHL for 530 shipped. I'll eventually complete the rest with a custom3" exhaust to finish. I say go with GHL. You'll love it.

 

[Striker187]

caution on the ghl downpipe.....there is NO flex section so you'll either need to add a flex section in or get at least a front motor mount. that or you can deal with an exhaust leak like i am right now....

 

[Titanium]

bla, exh tuning is more defined for n/a applications, true but size does matter even with forced induction. With any exh system its all about tuning it to your application. 3" isnt bad but either is 2.5" and it will support any amount of power that will ever come out of the stock short block. This is way I said that its not worth any extra money to go to a 3" pipe over the cost of a 2.5" pipe. Unless you are upgrading the short block and planning on big hp. Show me the proof that a 3" shows more power or the same type of 2.5" pipe that can justify the increased cost on a stock short block. Oh and guess I should add this cause for some reason you thought it was necessary: I dont give a s*** about your 3" exh!

 

[daedalus]

Very true. On the supra boards they proved that 2.5" didnt become restrictive until 750hp...

 

[msp35]

3" will have a lower (deeper) tone which I am looking for. After all is done I will have paid ~800 for a 3" turboback maybe less.
Plus the GHL just looks ******* awesome (headbang) (headbang)

-1

 

[speedmo21]

man so the sp2 isnt even 2.5? im thinkin either the thermal 3" or the sp2 for the catback section

 

[daedalus]

the sp2 is actually 60mm which is like 2.4" or close to it. Its not like your gonna notice the 1/13th of a hp loss.

 

[StreakinOraNgeX]

bla, exh tuning is more defined for n/a applications, true but size does matter even with forced induction. With any exh system its all about tuning it to your application. 3" isnt bad but either is 2.5" and it will support any amount of power that will ever come out of the stock short block. This is way I said that its not worth any extra money to go to a 3" pipe over the cost of a 2.5" pipe. Unless you are upgrading the short block and planning on big hp. Show me the proof that a 3" shows more power or the same type of 2.5" pipe that can justify the increased cost on a stock short block. Oh and guess I should add this cause for some reason you thought it was necessary: I dont give a s*** about your 3" exh!

My hypothesis is that 3 inches does make a difference. The ion tb exhaust made 22 whp overall and is 3 inches all around. Other exhaust systems arent that big and dont make that much power. The extra money part of the equation is damn near negligible when you go to a custom exhaust shop anywayz.

 

[ca_deal1]

I got 2.5 inch, I think they are the right size. But get what ever you like, coz either one will be way better than stock.
P.S. I agree DPS give you the most gain for $$.

 

[CasopoliS]

the sp2 is actually 60mm which is like 2.4" or close to it. Its not like your gonna notice the 1/13th of a hp loss.

.1" is major difference. m4j0r l4g (lol)

Like I said.... my car pulls wonderfully, and it could take more with my 2.5"
The 3" turbo backs out there are nice..... I will give you that.