Sparks or E-series?

Which would i get more hp from an e-series or curtis sparks? the only mods i have if k and n filter with outerwear and and i trying to decide if i am going to use 12 tooth or 13 tooth sprocket.

[kaneman23]

I just spoke with someone from Marcum and they told me that a slipon was all I needed since my motor was stock. I also ordered a KN filter w/outerwear and 165 main jet.

bump

thanks for all the comments and suggestions. now i know exactly what im going to get

[Matt Fisher]

I like the sarcasm:D

Assuming you're referring to the slip-on stuff? The power difference on a stock motor will be negligable. I'd suggest the WB. It's a spark arrestor, and you can add/remove disks as needed for tuning.

Although the full systems might make a smidge more power, the power differences will still be minor given the fact that the exhaust won't be a restriction on a stock motor.