as of right now i have a 4-2-1 header and the stock exhaust the rest of the way back on my minime set up. how much would bigger exhaust help? and what size?

 

2 1/4" is the most I would get fot a n/a d-series..Expect no more then a 5hp gain..

Anything bigger and you'll notice a loss in low end power,,

 

would a diy exhaust still be a good gain? or would it be better to just buy one?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crazyslowhatch &raquo;</TD></TR><TR><TD CLASS="quote">would a diy exhaust still be a good gain? or would it be better to just buy one?</TD></TR></TABLE>

Have you checked out kteller.com?
You get the piping kit for 88-91 civic..They come in different sizes ..They come in stainless and mild steel..But you have to pick out your own muffler..Check that out the prices are good..

I honestly dont have the patience to sit there and make my own exhaust..

 

thanks for the site

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FAQ SOHC UPGRADES &raquo;</TD></TR><TR><TD CLASS="quote">After the catalytic converter, is the Cat-back. Most people recommend using a 2.25" sized exhaust for the little 1.6L. And a lot of the aftermarket exhausts are 60mm or 2.3 inches. I believe that you should actually use no less than 2.5 inch. My dyno results proved that it adds more power than the 2.25 and I gained another 1 whp throughout the power band when I removed the silencer from the muffler. But, you also want to make sure you get mandrel bent piping and straight through designs on both the resonator (if you have one) and the muffler. If you don't get the straight through designs, you will loose power, it's that simple. However, with straight through designs also comes sound volume. A good compromise has is an exhaust that comes with a silencer. You can remove them for track days and leave them in for daily driving, as stated before, only losing about 1whp on a stock engine.</TD></TR></TABLE>