the.main.man

Should I upgrade both of these at the same? Can I do one now and one later? Do I need to change anything else like the MAF? I have the stock on there now.....

2000GT4.6

You can do it either way. You will see larger gains out of the plenum. And you can run a stock or aftermarket maf, both will work.

the.main.man

What is the stock size of both and what size should I go up to on the stock engine?

01yellowgt

the stock tb is 65mm. some say to go with a 70mm tb, some will say go with a 75. I got the 75

the.main.man

From what I see it doesn't hurt to go with the 75....I found a seller on Ebay who "ports" the stock ones....is this OK? I'm really torn now between a cat-back exchaust and the TB/plenum combo...they both cost about the same....I can do one this summer but the other would have to wait until next year....

01yellowgt

porting them would be good on the plenum, but cant really port the tb. a local shop can probly port the plenum if thats what you decide. I would go with the exhaust then. and get the tb/plenum later.

Dragon02GT

https://mustangforums.com/m_1080031/tm.htm

the.main.man

Read that already.....but thanks.....

the.main.man

I hate to advert for someone....but....http://cgi.ebay.com/ebaymotors/Musta...1908QQtcZphoto

Anybody have any useful info for me on this....I really need some direction.....

Car_Ramrod

id go with the exhaust. youd probably see slightly more gains from the tb/plenum...but nothing all that noticeable...and the exhaust would give you maybe half that power, sound INCREDIBLE, and maybe even increase your gas mileage.