i currently have just the mods that are in my sig. and i want to add something to it. ive thought about putting 1.6 rr's on it how much HP would i gain from these? i have also thought about a MAF would this give me some more ponies or not, im not sure what exactly it would do compared to stock. Is there another mod i should be considering for about the same cost of the rr's and MAF. any help would be greatly apreciated thanks.

 

Roller rockers and a tune.