I have an '88 F-150 4x4, 351 automatic.

I am torn between two exhaust systems.

#1 DIDO cat with duals and glass packs.

#2 DISO cat with Dynomax system with two pipes exiting on the passenger side.

I want a good sound, a little loud, but just not noise, a low rumble. The Dynomax system would cost $50 more so that's not an issue.

Which system would you recommend and if its glass packs what length would you use?

 

for a low rumble, non-stock cats and dual glasspacks would sound pretty good. Youd also have some crackle in your exhaust tone, which personally i like. The longer the glasspack, the quieter and deeper it will be. You can get anything from 10 inch, very loud and high pitched glasspacks, to 38 inch, quiet glasspacks. I reccomend anywhere from 15-24" for a good sound

 

I'm leaning towards the true duals with 24" glass packs.

Still want a lot of opinions.

 

I don't know which Dynomax muffler you're looking at, but here's a few tips. Dynomax Turbos have low flow, but the Ultra-flow has a high flow, very throaty, performance sound. Ultra-flows come in Stainless Steel and a "Welded" mild steel. You need the stainless steel ones or they'll rot out in about 2 years. Glasspacks are also mild steel. My suggestion is to use only a stainless steel straight-through design muffler. My vote is nay on the glasspacks.

 

id get 18" glasspacks, however i wouldnt expect your truck to be too loud with true duals and 2 glasspacks. Start screwing with your cats after that and then youll open up some sound!