SXGT

i hate these threads so much. 5 years ago I could answer the questions but ive been out of the loop for a long time.

mods in my signature. 2001 GT. do you think they add up to 15HP? i hate it when people say muffers give you 20HP. Ive not seen that on any N/A car. I am just going to assume i have an extra 15rwhp with my mods.

99GTvert

The catback will not make a measurable difference. Considering the O/R X pipe and the filter (filter also not much of a difference) you may have closer to about 8 peak rwhp over stock..maybe.

I never had my car dyno'd when stock but with an O/R H, K&N filter with the removed silencer (and I don't think anything else) it put down about 234rwhp.

SXGT

so why did my coil pack cost 250$ if it doesn't add power.