I have a question, what if you have a 2.75 cbe and dp, would a 3" hfc work just fine?

 

It certainly wouldn't hurt, although you'll get the same performance from a 2.75" HFC or TP - which are usually slightly cheaper. The worst bottleneck occurs at the DP/cat connection. As long as the cat is the same or larger in diamerter as the downpipe you're cool.

 

+1 plus you wont have any issues hitting the lower Tie-bars!!

 

Screw the rabbits, go with test pipe!

PM me hks.

 

lol andy, I still wanna pass emissions

 

I have an HKS downpipe from a FQ340 and I swear its only 2.5inch! Whats the stock evo exhaust diameter?

 

2.5''

 

I'm selling my Blitz 2.75 inch SS DP w/ flex section if anyone's interested, it was only on my car for about 3 months.

 

Thanks Rich. So what did you do to match a 2.75 downpipe to the (I presume) 2.5inch cat and then to a (yet again I presume) 3 inch cat back. That would be a nightmare of mismatched pipes.

 

the hks is mandrel bent though. probrably very neglible gains though.

 

Anyone know what the APEXi downpipe diameter is?

 

No my setup used to be 2.75" Blitz DP, 3" Perrin HFC, and a 3" Fujitsubo Cat Back. It actually all fit together fine. I just upgraded my DP to the Perrin 3" to gain a 1/4" and match the 3" Perrin HFC. Now my TBE is full 3".

 

all espelir dp's are 3" correct?