RE: Headers for SRT-4
Yes the Corsa sounds better. However, it by itself with no other mods doesn't add much hp. It's only a cat back. That's why I bought the DP from Maxxfab.What it does do is open the door for big power when you get to modding more. The Corsa, with the stock cat on just sounded a lot better but was not obnoxious IMO. It was when I put the 3" O2 and DP on when it got loud. REALLY LOUD. The cat does alot to quiet this car down.
So last night, I welded my Dynomax race bullet in. Not so obnoxious inside the car now at low speeds. It softened the bite a little. Mostly what it did, it seems, is kill some of the in cab resonance. It's still is kinda loud outside the car. I still gotta be mellow driving around the 'hood and by cops etc. but it's more liveable inside the car at all but one important speed. That is 70 mph. At 70 were spinning about 25-27hundred rpms and it resonates inside the car pretty good. If I drop down to 62-65 or go up to 75+ I get out of the resonation zone. Fortunately, for me, I spend very little time on the highway. Otherwise, the mufflerwas a good choice. When I'm doing say 50, they car is no louder inside than when it was stock. When I jump on it though it still barks, so the sound coming out is very much tied to the amount of throttle you give.
How did I connect the DP to the Corsa? I did NOT have the universal fit DP (The DP and the Corsa after the bottleneck removed were exactly the same diameter-what to do?)
When I put the DP in, I found that I had excess length. This was good. I had material to work with. I used my air powered cutoff wheel and hacked off about 2 inches. Then I took that piece and split it into 2 "C's" and welded each back onto the outside of the DP exit. I left a small 1/8" gap on one side and ended up with about a 1/2" gap on the other. I wanted about 1/8" on both so I source a filler piece that I cut out of the bottle neck and welded it into the side with the 1/2" gap. This formed an outer flange that theforwardend of my Corsa would slip into, with 1/8" gaps on either side so I could clamp it or weld it. I already had bought a 3" clamp from Pep Boys. I figured I'd clamp it since I was planning on adding a bullet muffler which at that time I did not have. This worked good until last night when I put the bullet in. The bullet is already set to go on the outside of a 3" pipe on both ends. So, I had to cut my homemade flange off. I welded the bullet to the DP and welded a shortended chunk of pipe coming out of the bullet which goes back to the first clamp section of the Corsa where I slipped them together and re-clamped.
So I hope that answers the questions. You need to have access to a welder and cutoff tools. With those tools and some ingenuity, you can do damn near anything you want.I own mine and I'm a mech so it aint nothin but a thing for me, but otherwise, I would tell you to take it to your fav muffler shop and have them do the connection.If you have the univ. fit DP, it wount be a problem unless you go to put a muffler on, then your back to cutting and welding something.
My system, even with the muffler, will still be too loud for some, so fair warning. I don't think it sounds ricey though, with the dual tips, it has the SRT-4 sound. That's about the best I can describe it.