Exhaust
 

ok I'm getting my exhasut done finally and i was wondering how big of piping should i get for my 91 accord i was thinking 2 and a quarter...all i have under the hood is stock with a short ram intake... i was thinking of getting a H22 sometime but i'm not to sure yet....i'll probably end up just souping my engine up a bit....
so if ya can let me know if 2 1/4 is good i'd appreciate that.. thanks...

2 1/4 is fine. minimal gains are found in the exhasut system. a header for your ride will help also.

4.2.1 a good header for my car? or 4-1?

4-2-1 is the best header design for our cars.
2.25" piping should be fine. I have 2.5" and didn't notice a loss of torque.

same here... 2.5" but under the hood is almost all done...
not a noticeable difference