I'm looking to open my exhaust a little bit. I currently have a cheapo OBX header, high flow cat, and APEX'i WS2 cat-back. I've been contemplating doing the 2.25 inch header collector mod to the header to keep the exhaust at 2.25 inches instead of bottle necking it at the collector. I know this is a common mod for B and H series guys on JG, DC, and other cheap headers. Has anyone done this with an aftermarket F series header? Any thoughts or opinions on this mod? I'm hoping to pick up a couple desperatly needed ponies on my top end.

 

Talk to your local exhaust shop buddy

 

dump the high flow cat!
Get a real cat that actually DOES anything to the car and the environment!...magnaflow or random technology!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SteveoBA8 &raquo;</TD></TR><TR><TD CLASS="quote">Talk to your local exhaust shop buddy</TD></TR></TABLE>
Yeah, I kinda figured exhaust shops do exhaust work

Anyone done this on an F?

 

i havent done it but i am curious as well.

 

Bump.

 

o Rly?

 

Anyone?

 

It's been dyno proven to add power a bunch of times. what more do you need to know?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jweller &raquo;</TD></TR><TR><TD CLASS="quote">It's been dyno proven to add power a bunch of times. what more do you need to know?</TD></TR></TABLE>
I've never heard of a dyno graph being posted (for an f series set up). I guess I'll just give it a shot

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jweller &raquo;</TD></TR><TR><TD CLASS="quote">It's been dyno proven to add power a bunch of times. what more do you need to know?</TD></TR></TABLE>

how's it done and what is needed?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hb_guy &raquo;</TD></TR><TR><TD CLASS="quote">

how's it done and what is needed?</TD></TR></TABLE>
https://honda-tech.com/zerothread?id=1226335

Basically, you'll cut the the pipe off after the collector and weld in a larger piping (+flex if you want). I know with my header, piping is smaller than 2.25 so the exhaust is still qute restricted even with aftermarket 2.25 exhaust.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HandoEX &raquo;</TD></TR><TR><TD CLASS="quote">
https://honda-tech.com/zerothread?id=1226335

Basically, you'll cut the the pipe off after the collector and weld in a larger piping (+flex if you want). I know with my header, piping is smaller than 2.25 so the exhaust is still qute restricted even with aftermarket 2.25 exhaust.</TD></TR></TABLE>

thanks....