I just thought i would ask since it has been a question in my mind for awhile now. Is there any gain in horsepower or torque when you remove the factory y-pipe and run a true dual exhaust system? My truck is a RCSB 5.3 with a K+N FIPK intake and exhaust. My current exhaust system consists of 2.5" true duals into a magnaflow x-pipe into 2 single chamber flowmasters with 2.5" turndowns. I also have a set of flowtech cutouts installed between the x-pipe and the mufflers. I kept my cats for emissions reasons and i went with the 2.5" instead of 3" because i was told that it would actually hurt my performance if i went with 3" on a stock truck. I like the way my exhaust sounds but i was wondering if i gained any performance from it? let me know what you guys think!! thanks!!

 

with the K&N and true duels the motor can breath allot better.

 

ive heard not to go the true dual route regardless of what you have even FI.

 

Could you explain further?

 

Im running X-pipe and TD's

 

I am running identical exhaust as you except I have 2.25 pipe and 40 series muffers. I like the way mine sounds too and as for horsepower and torque. I felt a little gain in power up top but lost bottom end torque from my previous setup. I don't know how much power I got from it.

 

i do believe that like what was mentioned, you will loose low end , but gain high end. most of the whole back pressure thing is a myth from what i have read, but it is still important to have a bit of it for your low end torque, that being my response to the true dual setup. i may be wrong though---do your homework and read everything you can before you go out and redo your exhaust.

 

i run true duals with an x pipe and she runs very well. but i dont worry about low end either.