borla xr1 race muffler 3.5 inlet 3.5 outlet

Big_D · September 24, 2015

Could you upload a sound clip?

Possibly tonight.. Work gets in the way

Are you getting that noise that everyone is talking about cause you removed the valve?

The 'noise' isn't that bad, v4 mode.. Depends what RPM you're at but i got used to it. I really didn't want that valve freezing closed in the winter so I just got it removed.

Big_D · September 25, 2015

Could you upload a sound clip?

Hopefully this works..

http://<iframe width="640" height="360" src="https://www.youtube.com/embed/c8CQ2f8Q0co"frameborder="0" allowfullscreen></iframe>

not sure how to make it show up^^

sneakypete6 · September 25, 2015

Hopefully this works..

http://<iframe width="640" height="360" src="https://www.youtube.com/embed/c8CQ2f8Q0co"frameborder="0" allowfullscreen></iframe>

not sure how to make it show up^^

Sounds really good! That was a cold start, correct?

Big_D · September 25, 2015

^correct

Silver ice 6.2 · September 26, 2015

^correct

Sounds good. I'm going to upload a reving video.. with still stock resonator and valve

Silver ice 6.2 · September 26, 2015

A little reving

DAP56 · September 26, 2015

Guys, what cost are we talking about here?

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Silver ice 6.2 · September 26, 2015

The muffler I got was $278.99 borla 40722. Muffler install was $45.. I'm not done with my set up yet

Silver ice 6.2 · October 29, 2015

Update.. finally put my tips on today. Left the flapper on and deleted the resonator.. sounds good. From the start I wanted to do my own version of a gm borla catback. And the final result... sounds better and I saved alot of money.. highly recommend. And to those who might ask yes I drove a 2015 6.2 with the gm borla catback and interior sound is the same but the outside sound is louder on mine...

5RWill · August 29, 2016

I used 40086.. damn near the same muffler. No resonator, no flapper valve.. Sounds perfect.

It really barks on cold startup, not too obnoxious towing either.

What differentiates the 40086 and the 40722? Why is the price so different? Sorry for resurrecting this thread.

STINSAN3 · May 23, 2017

I think I'm gonna go with the Borla XR1. Can't decide to delete the flapper and resonator or just the flapper.

5RWill · May 24, 2017

I'd delete the resonator. I love how mine sounds warm start but it's hardly noticeable during daily driving, and mildly noticeable when you stomp it. I want it a little more loud with more growl. Res delete seems to do that. I'd only delete the flapper if you're going to disable AFM.