You shouldn't need anything bigger than 2.5" ID piping. There aren't too many people here that run the 3" FMIC pipes. I'd suggest getting some 2.5" pipes as they'll bolt up nicely.

What FMIC did you get that has 3" pipes?

I personally have 2.5" piping and it fit up rather nicely..... i say get some smaller piping if its affordable if not then approiate couplers

If it's a money issue reducers are $13 a piece from siliconeintakes.com. You're going to need the two reducers one way or another if you run different pipes with the 3" inlets.

If it's a performance issue, it is adding volume to the intake tract which does add a small amount to spool up time. It is less restrictive as well. In my opinion, it's like an intercooler, I'd rather have it too big, than too small.

I say run them, then if you feel like it's taking forever to spool up (it won't) try running smaller pipes.

Sven97GSX said:

I just got my FMIC + pipes. the FMIC has 3" openings and the pipes I got are also 3"
~Sven

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3" pipes is overkill it will work but your hurting your spool up time.

2.5" is good for over 500whp, anything more than that is a track car.



2.5" piping is enough for over 90% of the members here.

The 3" piping may hurt spool by a couple hundred rpms at most.

Exactly spool up time is overated like mentioned above only a couple hundred rpms so don't worry unless you're picky. I use a big turbo and don't give a rats ass. It's all about top-end.

Large pipes aren't going to hurt spool - boost leaks will. Just run your 3" pipes, get a reducing coupler to make them work with a 2g throttle body elbow. As for the J-pipe, use another coupler, ATPturbo.com sells 90 degree reducing couplers and T-bolt clamps.

Thanks guys. I just purchased the reducers, going to see if I like it. I can always get smaller ones some other day. I definatly appreciate all you guys and your inputs.
~Sven