lizzyfan

Just installed pi intake and pi heads on my 98GT, what a big difference. I would like to upgrade my TB to a 70mm. Can I keep the stock plenum. Also, would I need to upgrade MAF. I'm sure I'll need a re-tune.

sandcracker21

yes u can keep the stock plenum.....but y?

a tune is not 100% needed but it will help

lizzyfan

So it would benefit me to replace the stock plenum????

sandcracker21

yes, it will allow the TB and CAI to do wut there supposta do in the first place

Blck98GT

would you like to give me the money to do a pi heads and intake swap..??? please.

Deannostang

Definitely go with the new plenum. Of the three intake parts, I think the plenum may achieve the most results by itself. The three parts, plenum, throttle body and CAI are all meant to work best when used together as mentioned above. My new throttle body came alive as soon as I added my new Accufab plenum. I had also previously just used a K&N filter with the air silencer taken out but finally popped for a BBK CAI fender well unit. I did notice a difference over the previous"poor man's" CAI arrangement I was running. Bottom line, make the three way change for optimum results.

GTowner4life

Is there anything to know before replacing the TB and plenum? Any fragile parts?

lizzyfan

THANKS FOR THE INFO!!!!!!
DYNOED AFTER PI INSTALL
245-RWHP
265-RWT

98HossGT

did you have a dyno before the pi swap?