I like the DynoMax Welded Ultra-Flow or the Goerlich Xlerator.
Nice, low rumble at idle and part throttle, but they really bark under heavy acceleration.
Both have a straight-through design that flows about 97-99% of a straight pipe.
I'm sure there are others that are made the same way, but I have hands-on experience with both of these.
Use the longest case you can fit under the car!
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