I have a 98 gt. 4:10 gears, BBK CIA, March Pulleys, flowmaster cat/back exhaust w/ mac off road x pipe, custom SCT tuned. Im looking at getting a upper plenum and a throttle body combo. What size and what brand should I get? Should I also get the spacer and if yes what kind? After this should I retune the car? Im new at this and I am just trying to get some input. Thanks everyone.

 

Hey, We where all new once.I researched this before I bought mine and I've got the Accufab 75mm Plenum & BBK 75mm TB.That might be a lil much for a pre PI engine. If you plan on upgrading the heads and say headers go with the 75mm. If you don't plan on changing those go with the 70mm size. Your MAF will adjust to the new air/fuel ratio. So, you shouldn't need a tune. Good luck with what ever you decide.

 

when i had my non pi motor, i had the Accufab 75mm TB and C&L plenum and it did fine. some say it's leans it out and to get a 70mm but mine did fine. Now with the 5.4 i have the accufab 75mm TB and plenum.

A throttle spacer? I know on trucks they said it's dyno proven but they were probably paid to say that. i woudln't buy it.

tune is not needed

 

No need for a spacer with the Accufab.They are already raised for that!!

 

oh I thought you meant the TB spacer...yeah don't get the plenum spacer either.