I've got 2 1/2 exhaust with a flowmaster muffler, I'll soon be getting a dohc Zc and going NA with it. Someone told me that 2.5 will cause backpressure problems robbing power from the engine, is this true?

 

Seems like a lot to a ZC for me.. But I run 2.5" with my B16. Exhaust gases must be flowing pretty good at 8,200rpm and 2.5" seem to be pretty standard with most B series.

But with D series I never really see too many people with 2.5, they usually chose 2.25" unless perhaps there is some forced unduction going on.

 

I'm running 2.5" piping on my dohc zc rex.

 

whats up with that CRAZY HUGE bottleneck?

 

Go 2 1/4" To much exhaust flow is not good either, Depending on your setup, Going to big can actually decrease power.

 

I ran 2 1/2" mandral bent exhaust on my ZC and it wasn't a problem (I was planning to boost). while you might lose a little torque (like Honda's have it anyway) you will gain a little HP in the top end.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SIRX &raquo;</TD></TR><TR><TD CLASS="quote">I ran 2 1/2" mandral bent exhaust on my ZC and it wasn't a problem (I was planning to boost). while you might lose a little torque (like Honda's have it anyway) you will gain a little HP in the top end. </TD></TR></TABLE>

Couldnt of said it any better myself.

 

Werd, thanks alot fellas.