right now got ztube with revup i was thinking of switching it to injen sp intake or the r2c ... wich intake would provide more power or should i change a different drop in ??

 

If you have a '05+ 6MT coupe your best mod is MotorDynes MREV2+5/16" spacer which Tony claims 18+RWHP and you can believe his claims! No exhaust system will give you those kinda gains! ART pipes and the HKS replica exhaust will complete the system.
Gary

 

got 03

 

R2C is my personal preference, that's what I run. It seals against the hood to help prevent heat soak but I don't think it makes any more power than the stock airbox with a good quality drop in filter. R2C uses arguably the best filters on the market so if you want bling in the engine bay and better sound go with an intake. If you want the most power stick with the OEM set up. If you want the best combination of both the R2C or the Stillen would be my suggestions.