2003gtstang

Ok. I currentally have a 85mm tb and plenum. Many say im loosing power so im looking to buy a smaller one. what would be the power difference from a 70mm - 75mm. Will it give me more hp than a 85mm. I havea jlt RAi intake. flowmaster catback and upr o.r x pipe.

defconfire

who even makes an 85mm tb/plenum?

avlon06

i saw someone post something about like 65mm or 70mm is like the best you can get? i duno if the guy is full of it or if there is some real science behind that?

2003gtstang

its custom ported to 85

blackstallion666

I say go for a 75mm and you should be good.

sstang

"its custom ported to 85"

I dont think any plenum has enough in it to port it to 85mm, not even an aftermarket one. I would take it off and measure it b/c I doubt it is 85mm.

2003gtstang

http://cgi.ebay.com/ebaymotors/Parts...=p4506.c0.m245

theres the link to the tb and plenum i had bought

StriderTacticaL

It says 75mm....

SVTfan4life

hmmmm, is that a scam, or is it for real? And if its real, does 85mm really make that much of a difference in power?? Any input on this guys....?

SVTfan4life

Im new here, but cant help it. but Strider, read the entire link thats posted, not just the title. ok? it said that its bored out to 85mm....