Somewhere i heard that if u don't have n e mods under the hood then getting
bigger piping will slow u down, is this true???? Also for the strut tower brace
for the engine what year model for a accord do i need to get and is the one in
the trunk the same one as the one in the front???

 

By piping I take it you mean exhaust piping. To answer your question getting piping that is too big will slow you done. If your exhaust piping is to large you will lose back pressure and therefore torque. You might gain a little top end but it won't do you no good with the loss of torque. You shouldn't get exhaust piping bigger than 2.5 inches unless you have turbo. Larger than stock exhaust exhaust piping works best with headers.

Strut bar is the 94-97 accord for the front tower, the rear upper and the rear lower tie bar.

 

carry out my original plan with an h22a turbo and 4 inch piping

 

f0de I'm working on that turbo h22a but I doubt I'll be getting 4 inch piping any time soon. Thats almost as big as the outlet on my exhaust.