i have a 03 lightning,has 4# lower pulley,super chip download. i just install an x pipe in the exhaust then into 2 40 delta flow flowmasters.system sound great,not loud but not quiet like the stock system.
was wondering has anyone done this modification & had the truck on the track or a dyno.? it feels like a possible 10-15 hp increase but unless its dynoed or run at the track its a guess.
any feedback would be appreciated. william

 

exhaust usually isnt worth much until you get up to the higher HP ranges. It is mostly for sound and appearance. I think you might see 5 on a dyno.

 

My spintech came with the X already in place. And the dyno showed it (the whole spintech catback) was'nt really a help. Did'nt hurt either.

 

Is the X pipe we all install in our trucks not too far away from the engine to give it any gains?