1999 7.3 Powerstroke with an Aero 3535L muffler

[GreaseMonkeyVIP]

continued lol......... but you will gain about 100-150rpm spool advantage, about 50-75* drop in egts unloaded and even more loaded and even more with a really nice custom made intercooler :) lol but I ran dynos back to back same day with both exhausts on the same exhaust aero mufflers.... Stock exhaust with 3050 and 5" tip and then like above mentioned with 4" muffler & axle back w/6" tip and it only gained everywhere! especially towing!!! Dyno proven you will not regret going 4" muffler back!!

[GreaseMonkeyVIP]

why not step it up from the muffler back or right before muffler back into 4" I promise you wont regret it one bit!!!! I had a very similar setup to you expcept a little more mods before I sold truck to my pops, he has a stack now lol but if you run from before the muffler into 4" about 12' from where cab ends and then have the muffler sit 12" or so from that transition so its at end of cab and then the axle back is 4" with 5-6" tip you wont lose any bottem end trq at all anywhere in powerband

[7point3powerstroker]

how much did that muffler cost

[classicchevydriver]

did the dp tuner and the garret 38r make a big difference in power?

i just ordered my dp tuner and wanna get that turbo with stage 2 injectors also...