- Jun 16, 2004
- 14
- 0
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I have a 99 GT. The only current mods on it right now is a Cold Air kit, Off-Road H-Pipe, American Thunder Cat-Back. The only other performance mods it will see is shorty headers, 3.73 gears, and possibly underdrive pulleys. I plan on installing the C&L plenum. My question is shoud I go wth a 70mm or 75mm throttle body? I know most of the people here have went with the 75mm but I was told by several people that it may be too much air and I cold run to lean. They advised me to go with the 70mm. Any input?