I am pieacing together a performance esxhaust system for my 1995 4cyl 2.2l toyota camry. im looking at about 125hp befor modifications,the car has a cold air intake and nology spark wires.maybe 10hp more. my question,would  2.5" dimater pipping for my exhaust system be to much for my cars engine . should i down size to 2.25" or am i ok. *the exhaust header i bought has a diameter of 2.5" so i used that as my guide.

I'd suggest measuring your exhaust backpressure. David Vizard suggests about .2psi for a no hp loss exhaust system.

Pay as much attention to the muffler you stick on the end of it. You don't want a muffler with perforated core that's restricting exhaust flow.

See if you can find info on the net from others with a car like yours. There's a forum for every make isn't there?

Part of what's right for your car depends in the end on your ability to adjust fuel air mixture as what it should be set at may vary a bit with which exhaust plumbing you use.


The nology plug wires may hurt more than they help..

You may be inyerested or wish to comment on the following written by a fellow MG owner

Exhaust tuning theory is actually fairly simple, it