Ok, i just installed the JLT ram air set up. Next weekend i am hoping to install a throttle body and plenum. Summit has the plenum and throttle body in one package. I am curious if I should get the 70 or 75 mm set up. advice is welcome. thanks you guys.

 

It depends on what other mods you will be doing or already have. If you are planning on keeping the motor N/A then go with the 70mm. Do you have LT's? This will also help since you're opening up one end of the chain you need to open the other too or else it'll bottleneck there. If you plan on heads on cams in the future then I would go 75mm.

John

 

IMO i would go bigger just incase you decide to go FI later down the road. BBK has their 78MM combo for like $280 i believe.

 

Problem is if he stays N/A it'll hurt his performance.

bikemikeb, decide what the overall plan is and then make your choice from there.

John

 

The difference is MINIMAL. Not noticable.

 

Get the 75mm. Minimal is still more.

 

I put a 75mm TB and plenum and didn't really feel a gain at all but it looks better

 

I made Outstanding numbers with mine.

 

PP 75mm

 

75mm will be fine