Ike theay are AAEN pipes that were made for the SRV540 and SS440 back in the day, these are the set that I have for my SRV. If your running stock carb jet up to 160-160MJ and pilot 100-105, and 2 3/4" holes on top of air box for better breathing in midrange and topend! I will be running these with rpc intakes and dual 38mmTM's
these pipes are 8hp on top and gains in midrange, this is from AAEN's set up nots and info. I will be wraping mine to keep the heat down under the hood!