okay i never ever rip on my car in 1st gear only for the fact that the tires spin and i dont want to bald my tires prematurely. so i get on it in 1st, tires spin a little and by like 5k rpms the car felt like it hit its face and i heard a loud backfire... tried it again and nothing. my mods are in my sig anyone know what i could be? i have some of those ngk 1 step colder copper plugs on order from south florida pulley will that help out a little?

also i feel like the belt may be slipping, maybe its just me but ne one have any tips to get rid of that/fix it?

thanks

-Anthony