StreetPilot said:
Depends on the catback you're going to use them with. H-pipes sound good with chambered mufflers like Flows. X-pipes sound good with most others, but using an X with Flowmasters doesn't sound quite right (to me anyway).
To each his own.
i had flows on a catted x... sounded great... not as deep as an h, and not as rhaspy as an x with flow-throughs.
anyways, as mentioned above, its entirely up to you. most people base their choice on their cat back. flow-through mufflers tend to be matched up with an x pipe. chambered mufflers tend to be matched up with h pipe.
I personally hate UPR. so if i were you, id stick with the CL unit, but for performance, you wont notice a difference (unless youre at 900 hp or something...) this choice is pretty much 99% preference, price, and availability.