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My Corsa Sport exhaust with 4...4" tips line-up well enough (or close enough for Government work).
Forgot to mention....what also helps is to have someone help with the install....have one 'rack' the pipes in the correct position while the other tightens them down.
Before I put my Borla Stingers on, I had Corsa Sports with 2 four inch tips. One tip was longer than the other, and I never could get them lined up exactly right.
I've been able to line up both the Magnaflow and Corsa systems perfectly on my car. It's an installer issue, it takes lots of time to get them just right. They all require some tweaks.
But seriously, they are separate cans so you have to play with them a little, my borlas came as a 1 piece set up. They line up nice but I'm sure they are welded on a jig.
Yep, you gotta screw with those suckers for a while to get em straight. You got side to side, up and down, and depth. Seems obvious but when you go to align them just seating the pipes deeper (for instance) will change the tip angle AND depth. It can be suprisingly tricky to get em just right. It doesnt help that nothing back there is a straight line to give you a frame of reference. It took me forever the first time I did it and still didnt get em straight. The second time I was drunk and got em just right in about a 20 minutes. Go figure.