I know the car runs a bit rich out of the factory, and that's why many people have gotten a hp/tq gain (5-7), but with the plenum which increases airflow dramatically, and thus making it a bit more lean. My question is, has anyone seen any hp gains worth the trouble of buying this mod WITH the plenum? I don't think it'd be worth it for only 2-3hp for $320+install.

 

people usually see 7-9 hp with good tuning.

the gain is not what's important IMHO. it's the feeling and knowing that the car is running right w/the proper ratios.

there is a good post by SizongZ about his S AFC-II experience.