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I just did the SPX 5+5 wheel and chose that over WW2 because it would produce more turbo whistle. The WW2 will give you a little more top end boost as well. I drive like an old man so decided to with sound over speed. haha. My last truck has 6.5 TD engine and had the best turbo whistle.... I missed it.
I also did the EBPV delete, 3" DP, 5" exhaust, and TS6 chip.... all in all it made a very big difference. Im still chasing a p0500 code that is causing my shifting to act up but the chip made a world of diff in drivability of the truck.
They aren't fun but can be done in a day with the turbo out. I think you are looking at the International pipes. Riffraff Diesel's are only about $490 and way nicer than Internationals or any other I have seen.
I will look. I didn't see any area that looked like it was leaking but who knows. with the turbo out are they easy to replace? Or replace the donuts? Im not to excited to dump a 900 into riffraff pipes that likely cost 200 to make.
Coming from somebody who has made quite a few of these as well as a dozen t4 kits, I'd be very happy with paying his price for a set of pipes...