[Nismo240]

i think the best way would to be to get aftermarket pistons, so i would go ahead and just build the bottom end.

 

[Nismo240]

a thicker headgasket will also lower compression. a 3in. exhaust will give you power while you're still NA, but you'll lose a lot of your low end power.

 

[Nismo240]

well i'm going with other people (that i know personally) and personal experience. when i got my exhaust done (only 2.5"), it lost a lot of torque, making the low end seem weak, but the top end improved greatly.