Exhaust questions, 3inch or 2.5inch?

[Guest]

Hello all,

I am looking at getting a mid section for my BH GTB Legacy which will include a high flow cat. I am hoping to gain a few more horses and have a little more response if possible. Is 3inch appropriate for the Legacy?

Has anyone experienced losses in power after a catback on the Legacy? Loss in torque? What should I expect from a catback on the Legacy?

Thanks

William

[Guest]

 BigWillieStyles said:

Hello all,

I am looking at getting a mid section for my BH GTB Legacy which will include a high flow cat. I am hoping to gain a few more horses and have a little more response if possible. Is 3inch appropriate for the Legacy?

Has anyone experienced losses in power after a catback on the Legacy? Loss in torque? What should I expect from a catback on the Legacy?

Thanks

William

I have 3 inch from turbo back but with two silencers as well of the same diameter

Cant say I noticed any loss of power

Only problem is that its a bit low under the diff so scrapes some times

[pl0x]

Use search dude, heaps of threads discussing. pro cons etc

Think 3" down pipe then 2.5" cat back is the "best"

[Guest]

id run a 2.5 dwny to a 3inch back.

[GorGasmSpecB]

 sti8u said:

id run a 2.5 dwny to a 3inch back.

why?

3" down to 2.5" sounds like a smarter idea.

[pl0x]

 GorGasmSpecB']

[quote name='sti8u said:

id run a 2.5 dwny to a 3inch back.

/quote]

why?

3" down to 2.5" sounds like a smarter idea.

yea hot (expanded) fumes right after turbo then cooled slightly after DP so less diameter needed?

also i just seen its on a TT, which if your only doing cat back id go for a 2.5" if you can find one. most likely you will find a 3" cheaper because thats what everyone has etc

standard downpipes to 3" is making heaps of noise imo, any power gains you would see with a 2.5" also (and less noise in theory)

[Guest]

Ive actually noticed that a few of the performance exhaust setups from Japan have 2 and 3/4 piping. Im wondering now if its possible to get piping in this diameter and what sort of car I would use (2inch or 3 inch).

[pl0x]

 BigWillieStyles said:

Ive actually noticed that a few of the performance exhaust setups from Japan have 2 and 3/4 piping. Im wondering now if its possible to get piping in this diameter and what sort of car I would use (2inch or 3 inch).

From what strong Subaru told me, a lot of the so called 3" downpipes are really 2 & 3/4" downpipes. Wouldn't surprise me if there are systems that size.

i still think 2.5" would be plenty if your keeping factory downpipes