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So on my old Titan I had the full Cajun setup with headers all the way back and a Borla XR1 40944. Loved the way it sounded.

With nothing being out yet for the gen 2's, I'd like to at least do a Borla muffler swap to a XR1. Obviously that is a single in, single out muffler and stock is a dual in, single out. Is the easiest way just to go ahead and get a Y-pipe then have it welded on before the muffler? Some say it needs to be 8-10" before the muffler and others say directly in front of the muffler works. Can anyone clarify for me on which is ideal? I could get the Borla ProXs and just swap it right in, but I really liked the XR1.
 

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So on my old Titan I had the full Cajun setup with headers all the way back and a Borla XR1 40944. Loved the way it sounded.

With nothing being out yet for the gen 2's, I'd like to at least do a Borla muffler swap to a XR1. Obviously that is a single in, single out muffler and stock is a dual in, single out. Is the easiest way just to go ahead and get a Y-pipe then have it welded on before the muffler? Some say it needs to be 8-10" before the muffler and others say directly in front of the muffler works. Can anyone clarify for me on which is ideal? I could get the Borla ProXs and just swap it right in, but I really liked the XR1.
Not sure about the Pro XS. I ordered one thinking it would be a simple cut and weld muffler for OEM piping...not the case. bending and/or adapters would be required to make it all work so I returned it and went with the Cajun Y system. I'd imagine a few companies are working to make a system that will work for the new Titans with a y configuration. If not, an exhaust shop worth their salt should be able to accommodate you. I had the XR1 for a while until long tubes and cat deletes. Eventually it became too obnoxious for my preference and I replaced it for a longer Borla, the 400436 on my 2014. In short if you cant find a plug and play system that you like, and exhaust specialist shop should work alright. You will have to pay a premium for custom service and fabricating, but it would be worth it. Last time I had an exhaust shop build a manifold back system was in 2011, around $800 for a short bed Chevrolet, manifold to tips, all new and stainless.
 

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I too recall hearing 8-10 is optimal. Depending on which Y you go with, welding it directly to the muffler can give you close to that distance. I have a 304 stainless summit racing Y pipe that I had welded directly to my XR-1. I've never measured it, but I'd guess there is a solid 6-8 inches of merge after the inlets. It has worked flawlessly for me, and was a noticeable improvement over the all-in-one y pipe/muffler I had on the MBRP setup (which had basically no merge, both pipes dumped right in to the muffler).

Here's a picture of mine when I installed it. I haven't had any issues with it. The performance has been great, and the sound is incredible.
 

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