Hey guys,

I'm looking at several aftermarket exhausts right now and thinking what's the best pipe size for the stock D16Y7? I have a 97 LX sedan. I'll be doing the cold air intake, header, and high flow cat. Some manufacturer make 2.5" and some make 2.25". I'm afraid if it's too big, then it'll lose back pressure. I have couple performance cars before (MR2, 240SX), but I'm new to civic

Let me know what you guys think. Thanks.

 

2.25" worked fine for my y7

 

2.25" is all you need. 2.5" will still work though.

 

i say 2.5 that way you will have plenty of room if you want to go forced induction...etc
read this about back pressure http://www.nsxprime.com/FAQ/Miscella...austtheory.htm

 

2.25 no need for overkill.

 

if you want to go forced induction anytime while you have the car, you should get 2.5

 

My guess is that 2.25 is good for 200+ HP, so that's what I went with.

 

thanks guys for ur responses. i don't plan to go turbo or supercharge at all. this is the daily car that i just wanna squeeze out as much power as possible on the n/a router.

 

Hey i got an axleback muffler and its piping size is 2". This is only an axleback and i just wanted to take out my stock muffler and put this one in. When i bought it i forgot about the size piping to get and i just read it will fit on my 97 4dr civic. Would it fit on my 97 civic d16y7??I see there are different size piping for the exhaust. I just wanted to ask before i tried installing it.

 

You should be fine with that. Stock is ~ 1 7/8". The stock b-pipe to axle back connection uses a donut gasket. As long as the new muffler has the same type of flange as the OEM, you should have no exhaust leaks. If you want, you can also replace that donut gasket, too while you are in there.

Also, if the bolts have not been touched in years, they will probably break. Make sure you have replacements on hand.