Yeah...I now have PEM'*..however when I pullied I only had a gutted air box. I took many scans before and after the PEM'*.

Note: 3.4" installed in the beginning of Novemeber and I live it CT...so 50-70 degree days.

Before PEMs:
3.4 pulley would get me 2*-4* KR in warmish weather. no kr at all in weather below 30 degrees.

After fixing up my gutted airbox to pull better air from behind the headlight.... I didn't check for KR..but it felt a little better.

Putting the PEM'* on.. KR is inconsistent and non existant under 60 degrees. I saw no change adding a high flow cat.

Mind you it is still a little cool out but I think for us with small mods 3.5 is perfect and you will notice a huge difference.I have FWI , 180 , 104 autolite and a standard intense PCM never see KR.Although I have a 3.4 I am not even going to bother for now.Happy with HP for now.

umm stupid question but what is a PEM? im just bout ready to order the 3.5 inch pully and i just wanna be sure so i dont like blow my car up

Ported Exhaust Manifold, basically makes the exhaust free flowing where the restrictions are....

you wont blow up the car with the 3.5, you will be fine with a CAI/FWi or a Gutted airbox, and a 180 thermo

haha ok thats good to hear alright so i finaly found a 3.5 pully on zz performance and now my last question is were can i find a gatorback belt that will fit the i found a few that would fit the 3.4 or could i use the stock one....i wasent to sure if it be to long....

so what is the likley power increse im lookin at itll deff be noticable right...i just want a little more get up n go power

wait i answered my own question.....a 98 bonneville is the w body right i found one on the intense racing site

That would be the 715 belt. Trust me,I know

Thanks for the giggle Cap'n Belt Slip.

I'm with Scott (aka Dbeast) on that... 715 is the magic number.

No, a Grand Prix is a W body.
A Bonneville is an H body.