I have a 2000 GT and I have a mac off road H, Flowmaster cat-back, and a SCT Tuner. I was wondering if I should get a 70 or 75mm throttle body to go with a plenum and the JLT intake I am ordering. Some people 75mm is over kill.

70mm if your just doing basic mods....75 if you get a s/c.... the 75 allows more air but wont see the full benefit without forced induction of some sort

it costs 10 bucks more and sets you up better for later on down the road, if not helps you more. Get the 75. In a stick it shows the comparison on a relatively stock engine. The 75 wins.

75 wins for sure... friend went to get a 70 from a site and they didnt have any cuz they said it was a waste and he wouldnt see much gain at all

75mm with a good tune makes a noticeable increase in power. Even over mild mods.

Yeah I have the SCT and I'm getting the 4" JLT and a friend of mine has both of those and he said his car bogs at low end from the bigger throttle body and went with a 70 instead.

75mm, bigger is truly better

Tropic, sorry this is a little off subject but I noticed in your sig that you have the same exhaust setup I was looking at getting. Think you could give me a description of the sound you are getting from it or even some sort of sound clip? Thanks.

I love it. The flowmasters sound great with the mac off road H. I get compliments all the time and a buddy of mine has the Mac Pro chamber and he likes the sound of mine more. I highly recomend going with that set up.

Which set of flowmasters did you go with? 40 series? What did they cost you?