Installing Mopar Street exhaust -- how to position?

cowger · Jan 18, 2013

Hi,

I'll be installing a used Mopar Street Exhaust setup this weekend (thanks Mike / unreelviper), and have a question about how to properly position the tip in the opening in the sill. I know I need to bias it toward the front to allow for thermal expansion, but without instructions, is there a way to measure for this? For example, "leave no more than 1/2" of space between the front of the tip and the front of the opening", or something like that.

Also, I'm just planning to take a sawzall to my old Gen3 exhaust unless someone gives me a good reason not to. And I'm thinking "hold onto the old exhaust just in case you ever want to go back to it or sell the car" is not that reason, at least for me...

Thanks!
Bryan

Flexx91 · Jan 18, 2013

Go to the Corsa website and download the .pdf file. It will show you the rough measurements for the tips and torque requirements. You will still need to do an "on-off" with the sills several times before you're comfortable with the final positioning. And since you already understand the thermal expansion issue, you should run the car through at least two heat cycles (start it up and run until it reaches maximum temperature then shut it off and let it cool) before the final tighten of the clamps and final re-installation of the sills.

I assume you're talking about sawing off the crossover. I managed to wiggle mine out the frame withouh cutting it but eventually tossed it in the trash - as there is no way I would fight trying to get that thing back into the frame should I decide to remove the Corsa.

Flexx91 · Jan 18, 2013

By the way, the Mopar Street has a decent sound but be prepared for the drone.

Allan · Jan 18, 2013

With the sill removed, I referenced measurements from the wheel and the bottom of the rear quarter panel before removing the stock exhaust. Then test fit / adjust a few times to line things up before tightening things up. Needs to be set up with more clearance in the rear of the hole (not centered), as this system grows quite a bit when hot. -don't ask how I know.

mjorgensen Woodhouse · Jan 18, 2013

Once you have everything where you want it, it is best to put a tack weld on the exhaust BEFORE you tighten the clamps fully. This will help retain the tip position as sometimes it can change when you are tightening the clamp first.

pdub · Jan 18, 2013

I just installed a Corsa system and did have to make several adjustments putting the sills off and on. Not too hard if you have a second person (thanks wife!) helping out. fyi....the tips didn't move as much as I thought they would though.

Flexx91 · Jan 18, 2013

As mark said, it's best to tack weld the muffler to Cat connections prior to tighening everything up. The Corsa instructions recommend this step as well.

FrgMstr · Jan 18, 2013

I had movement problems with the band type clamps. Go to the auto parts store and get some traditional U shaped exhaust clamps, these have worked flawlessly in my experience. And drill a hole as shown as it allows the side sill to be removed easily. Hole should fit a 10mm long socket. As for the Gen III stock exhaust, mine came of fairly easily from under the car without a sawsall.

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cowger · Jan 18, 2013

Thanks, everyone, great tips! I did find the Corsa instructions, which are excellent.

Regarding drone, the previous owner assured me that these did not, but frankly I can't figure out from searching this forum if they are going to be a problem or not. I'll just install and see (or hear, I suppose)...

Bryan

VicTxV10 · Jan 18, 2013

They will drone..a lot!!

cowger · Jan 24, 2013

Stock exhaust removal tool

Quick update: I have to admit that I probably had more fun than I should have cutting the old Gen3 exhaust out of there. But a sawzall made it a breeze and I didn't even have to take off the belly pan:

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I know we've resolved that the H-pipe (or I-pipe

) is a real crossover, but here's photographic evidence...

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I have my new (used) Mopar street exhaust on. Sounds great at idle and low revs, but now I need to wait for better weather to see if they drone or not. I actually have no idea what drone sounds like, but I suspect I will know if it I hear it...

cowger · Jan 25, 2013

With a sunny afternoon here in NorCal, I was able to get my car out for a few miles. In short, I'm extremely pleased with this Mopar Street exhaust setup. It's louder at idle and during acceleration, but popping on deceleration doesn't seems any worse than stock and cruising along on the freeway seems no louder, either. I really like the deeper, more guttural sound at idle and low RPMs. IMO, it's more like what a big-displacement racecar should sound like!

Several people seemed adamant that these drone, but while I don't know exactly what is meant by that, I'm still not convinced that's true. Does it refer to a louder noise under acceleration? Or a resonance at cruising speeds?

For anyone considering whether to do a transaction with Mike (unreelviper), please do so with confidence! He stood behind these all the way and was a pleasure to do business with.

Go Niners!
Bryan

eagles · Jan 25, 2013

Cowger, I pulled off my stock crossover system [saved it though] and installed a Roe exhaust similar to your Mopar exhaust years ago and never have I had an annoying drone. However engines I have experience with---- mostly mopars [hemis and b blocks as well as 340's] there is a sweet spot at a certain rpm range which some might consider a drone. It is a sweet sound to me. Of course I don't have much hearing left.

eagles

eagles · Jan 25, 2013

GO NINERS!!

eagles

Sonoman · Jan 25, 2013

Drone is a resonance at certain RPMs. It can seem that the interior of the vehicle forms a resonant cavity with certain frequencies, but then, you can get a serious drone effect on a motorcycle as well. The offending RPM range may be narrow and you have not hit it yet, or your setup just doesn't drone. One factor involved is of course the ear of the driver. If you spend a few hours driving and nothing bothers you then all is good and no worries... at least for you! :2tu:

Installing Mopar Street exhaust -- how to position?

cowger

Viper Owner

Flexx91

Viper Owner

Flexx91

Viper Owner

Allan

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mjorgensen Woodhouse

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pdub

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Flexx91

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FrgMstr

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cowger

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VicTxV10

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cowger

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cowger

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eagles

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eagles

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Sonoman

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