Resonator Delete for Performance

[TEXAS HEAT]

I just wanted to solicit some feedback on whether or not replacing the exhaust resonator for a Flowmaster Y-pipe mated to the factory pipes and mufflers would net any gains? At this point, I'm not ready to install a downpipe, but I don't want to shell out the cash for a full cat-back system. Can anyone attest to this being a reasonable bang for the buck mod?

http://www.americanmuscle.com/flowmaster-y-pipe-2015gt.html

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[Slow89]

Best bang for the buck would probably be DP and muffler delete.

 

[doulos4jc]

The big HP restriction on the exhaust is the stock down pipe. Leaving that huge choke point in place is pretty much gonna wipe out any significant HP gains from cat back mods.

 

[ForYourOwnGood]

The big HP restriction on the exhaust is the stock down pipe. Leaving that huge choke point in place is pretty much gonna wipe out any significant HP gains from cat back mods.

Yeah but the piping into and inside the resonator is 1.9-2.0 inches. Thats got to add a lot of restriction. My resonator came off with the stock exhaust at 800 miles and the back half of it was severely heat cycled.

 

[gtmorgan23]

Changing your downpipe would nuke your warranty if anything happened correct? catback generally doesnt do that.

 

[TEXAS HEAT]

Yeah but the piping into and inside the resonator is 1.9-2.0 inches. Thats got to add a lot of restriction. My resonator came off with the stock exhaust at 800 miles and the back half of it was severely heat cycled.

Can you give some feedback on your impressions of the resonator delete? List of mods and are you running the factory cat-back minus the resonator?

 

[Juben]

Can you give some feedback on your impressions of the resonator delete? List of mods and are you running the factory cat-back minus the resonator?

I had the resonator delete for a very short time on the stock mufflers and then on the Magnaflows. On the stock mufflers, it wasn't so bad because they muffled a lot of the sound. With the Magnaflows, it sounded like butt. I ended up install a Vibrant resonator and it really made things nice. Overall, if you're gonna remove the factory unit, I'd replace it with a higher flowing resonator. Also, for what it's worth, the resonator is the least restrictive piece in the exhaust system. The cat is always gonna be a bottleneck, but the stock mufflers aren't too far behind it.

 

[TEXAS HEAT]

I had the resonator delete for a very short time on the stock mufflers and then on the Magnaflows. On the stock mufflers, it wasn't so bad because they muffled a lot of the sound. With the Magnaflows, it sounded like butt. I ended up install a Vibrant resonator and it really made things nice. Overall, if you're gonna remove the factory unit, I'd replace it with a higher flowing resonator. Also, for what it's worth, the resonator is the least restrictive piece in the exhaust system. The cat is always gonna be a bottleneck, but the stock mufflers aren't too far behind it.

Do you have the p/n of said resonator?

 

[Juben]

Do you have the p/n of said resonator?

I think it was the 1791. It's an 18" bottle type resonator. I also picked up a Y-pipe to attach it to the factory duals. I used a Magnaflow Y-pipe for that. In hind sight, I probably would have picked up a single inlet (offset)/dual outlet muffler from Magnaflow or Borla though just because it's one less piece and would still offer about the same tone and volume.

 

[TEXAS HEAT]

I think it was the 1791. It's an 18" bottle type resonator. I also picked up a Y-pipe to attach it to the factory duals. I used a Magnaflow Y-pipe for that. In hind sight, I probably would have picked up a single inlet (offset)/dual outlet muffler from Magnaflow or Borla though just because it's one less piece and would still offer about the same tone and volume.

Do you have any images of your set up?

 

[shelbywannabe]

Yeah but the piping into and inside the resonator is 1.9-2.0 inches. Thats got to add a lot of restriction. My resonator came off with the stock exhaust at 800 miles and the back half of it was severely heat cycled.

Go home tonight and put a 2" hose on the end of your garden hose. Turn it on. Is there now more water coming out ? If the restriction is at the beginning of any anything that has flow whatever you do after that point will not give you significant performance gains.
You may be cutting down any additional restrictions but that stock down pipe is noted to being the biggest restriction.

 

[vernonator]

Changing your downpipe would nuke your warranty if anything happened correct? catback generally doesnt do that.

Define "nuke" - IF they could track the issue to your downpipe they may deny your claim. But if by "nuke" you mean void, then nope they can't just "void" you warrant.

FYI - I ran non-catted downpipes on my '12 SHO (TT V6) and had no problems with the one warranty claim I made (front shock mounts). True it was not drive train related, but it shows that mods don't "void your warranty". :headbonk:

To the OP - bigger downpipes will be great bang for your buck. On my SHO (with a livernoise tune) they resulted in much improved low-end torque. Great first mod for the Ecoboost engine.

 

[ForYourOwnGood]

Go home tonight and put a 2" hose on the end of your garden hose. Turn it on. Is there now more water coming out ? If the restriction is at the beginning of any anything that has flow whatever you do after that point will not give you significant performance gains.
You may be cutting down any additional restrictions but that stock down pipe is noted to being the biggest restriction.

You're missing the point. He asked IF there was performance gain, not if it was THE BIGGEST performance gain. For warranty reasons many people don't want to remove the downpipe but the resonator is fair game. It is also probably cheaper.

I understand perfectly what you're saying and agree the biggest gains are getting the hot air moving out of the turbo as efficiently as possible, but that wasn't the question that was asked.

 

[TEXAS HEAT]

You're missing the point. He asked IF there was performance gain, not if it was THE BIGGEST performance gain. For warranty reasons many people don't want to remove the downpipe but the resonator is fair game. It is also probably cheaper.

I understand perfectly what you're saying and agree the biggest gains are getting the hot air moving out of the turbo as efficiently as possible, but that wasn't the question that was asked.

Correct! I realize the biggest gains are achieved by optimizing the entire exhaust system by removing all bottlenecks, but what I originally asked for was opinions and whether or not it would be a decent bang for the buck modification that didn't compromise emissions compliance. I actually have a catless downpipe but have been reluctant to install it. I don't want to shell out the money for a full cat-back at the moment either. I was hoping to gain insight to determine what the general consensus was on deleting the resonator knowing that everyone will likely have a different opinion or perspective. So, all is good and I appreciate all of the feedback.

:cheers:

 

[ForYourOwnGood]

Correct! I realize the biggest gains are achieved by optimizing the entire exhaust system by removing all bottlenecks, but what I originally asked for was opinions and whether or not it would be a decent bang for the buck modification that didn't compromise emissions compliance. I actually have a catless downpipe but have been reluctant to install it. I don't want to shell out the money for a full cat-back at the moment either. I was hoping to gain insight to determine what the general consensus was on deleting the resonator knowing that everyone will likely have a different opinion or perspective. So, all is good and I appreciate all of the feedback.

:cheers:

Yeah the downpipe would probably be the biggest overall gains, but geez this stock catback:

[ame]

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