We're new members and have a 2005 GT it has roush axle back mufflers but we would like a little more rumble out of it. I talked to Brenspeed & the guy I talked to suggested to delete the cats with a new tuner. It came with a Diablo tuner. I'm wondering if any one has this set up . Would I be better of with long tube headers & high flow cats or just change to high flow cats with my mufflers? I don't want to end up so loud I can't drive it. Any thoughts would be appreciated. If anyone has this that I could listen to that would be great. Thanks
Makes it sound really good according to everybody behind me. I've not really heard it since I'm always driving my car. Ha ha. I'm not sure if the high flow cats by themselves will do much. I did the headers, H pipe with high flow cats and the axle back mufflers as a package. I went for horsepower and the great sound was a bonus. Don't do shorty headers they are a waste of money no horsepower gains and not much sound difference from people I've talked to.
Post by thunderfoot1992 on Jul 12, 2016 18:03:25 GMT -5
High flow cats with stock exhaust manifolds do not provide the best bang for your bucks. They work best with full length headers. I agree with staing on the shorty headers, they are waste of money. I am running full length headers with high flow cats, H pipe and 3" pipes to JBA competition mufflers very similar to Chris's and it gives you a deep sound without the drone at highway speeds. The guys at Brenspeed are great and I have run their tune in the past. If you go with headers you will definitely need to have someone retune the ECU.
Post by Lord Swank on Aug 22, 2016 20:42:06 GMT -5
I have Kooks 1 7/8 long tube headers, with an offroad H pipe.... and magnaflow competition quad exhaust axle backs... I couldn't be more pleased. If you are working on a smaller budget, this wouldn't work for you, but if you want a great muscle car sound, that will let anyone know you're there... I recommend this. I have taken it on long drives, at 2-3k rpms there is slight drone, but at 70-80mph... it sounds really good, and idle is terrific.
I'm sure some of you have heard me touch it off a few times at our meets