I'm planning to do a stage 2 on my 2012 gsr but still debating which one is the best. Should I go cobb, perrin or ams? I'm thinking of going perrin. Any suggestions?

 

I am running the stage 2 with an AMS catback and the COBB downpipe and catted test pipe. I like it. But an AMS stage 2 from the AP has better gains than the COBB stage 2 since if memory serves me correctly the COBB intake is just a filter.

 

The Cobb intake refers to the SF intake ( filter and bracket) as well as the cobb silicone turbo inlet pipe. Same as any other intake.

 

So which one gives good gains as far as awhp & wawtq?

 

They'll all be nearly identical in terms of the gains, get whichever you prefer. I don't really have much from AMS, but I've had good results with both Cobb and Perrin products.