Muffler Delete Question
 

I have a MRT muffler delete, dual exit. It's quite damaged from getting run over (long story). All the damage is on the right side of the exhaust, it's pinched flat.

I can simply cut the exhaust just to the right of the left side hangers and cap it, turning it into a single exit (as marked in picture). Question is would this hurt the performance of the exhaust at all? It looks to me like you'd still have plenty of flow, albeit the dead end would create a tiny bit of a bottleneck. I'm running an otherwise stock car with no tune (street class autocrosser so that's all I'm allowed). I was planning to switch to a single exit anyway.

I don't know a whole lot about how the exact shape of an exhaust impacts flow and sound. Thanks for any opinions.


https://image.ibb.co/mTsM8m/Screensh...1_Z151_MRT.png

It would not hurt performance by any significant amount, although you would be creating a sort of Helmholtz resonator out of the stub from the cutoff part. That will change the way the exhaust sounds, but that's going to change anyway.

You could perhaps do some calculations and tune it to cancel out any drone frequency that's bugging you. Just need to figure the volume of the dead end cylinder you're making and weld a cap on it.

My 2 cents...

Thanks, the Helmholtz resonator effect did cross my mind. But I have no idea on how to approach calculating the frequency the resonator would cancel out. So unless someone with a little more engineering knowledge can chime in, I'd be guessing as to the size lol. If I don't get that figured out I'd just cut it as short as possible to save weight.

Get an exhaust shop to make a capped tube with a slip joint u bolt to hold it in place. You can slide it in and out and adjust until you're happy with it, then have them weld the cap on to ensure it doesn't leak in the future.

I don't know how this brand designed theirs, but the WORKS version of this design actually has a smaller internal exit hole for the driver's side exhaust pipe. Presumably in order to balance out the sound.

I would visually check with a flashlight to determine that both exit pipes are fully opened.

Enjoy.
[ame="https://www.youtube.com/watch?v=azPKIjxmmdU"]Exhaust Header Bash! Testing Power Loss From Dents - Engine Masters Ep. 4 - YouTube[/ame]

Best bet is to weld in a vibrant resonator, or switching to an axleback that has a muffler. I had the berk muffler delete and it seems completely like yours, and I remember someone welding in a resonator in with good results.

Oh, dutchman1, you're on the verge of overthinking this. I'd suggest you just cut it off and cap it about where your line is.

The exhaust will find it's way out ....... it only has a 2 liter pump.


humfrz

It would be fine, but I would personally just buy a J2 Engineering muffler delete off eBay. They're cheap and mine's held up well.

Haha I think you're right. This somehow turned from "is it okay to cap this" to "lets engineer a catback."

Thanks for the input everybody.

And to address the concern of another poster, the driver's side pipe has no restriction in it so that shouldn't be an issue.

I'll let everyone know how it turns out.

If the design is like other similar muffler deletes, the driver's side is much smaller than the passenger side. Most of the exhaust actually goes out the passenger side (I had a Berk and have a Works). So I think it may be a restriction and cause high RPM power issues. Measure the most restricted part of that exhaust and if you can, have it bored out or drilled out as much as possible so it's no smaller than 2.25"

Like Williampreza said, you could make a helmholtz out of it. If it was me, I think I'd lop off the pipe right there and leave it open or even better, drop $150 for a berk single exit