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 guid.

>>>>>>>>>>>>>>>>>>safty valve

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Exhaust tuning theory is actually fairly simple, it