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Do it! In normal mode the car sounds the exact same. In sport mode stomp on the gas and it is a good 15 or 20 percent louder. The R's come without the resonators so basically removing them on the standard GT350 makes your car sound just like an R. I had mine done the first week I owned it and have zero regrets. On the contrary, I love it.
 

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Hello Txgt350 could you share the contact or place of the place you use to delete the resonators, I'm also in Texas and I would like to do it to my car.
Thanks.
 

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Discussion Starter · #7 ·
Thanks for that info. Just to clarify; because there is always much confusion about this. The resonators are the large boxes at the rear of the exhaust--correct?
 

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Thanks for that info. Just to clarify; because there is always much confusion about this. The resonators are the large boxes at the rear of the exhaust--correct?
I don't have any plans to remove mine for this year. I do believe the resonators are before the mufflers.
 

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Well The GT350 R has no resonators, so removing them would make your GT350 the same (10-15 % louder?). As far as improving flow for better performance, that depends on the exact resonators used. Smooth perforations in the core will actually flow better than straight pipe (this has pretty much been demonstrated). Pimpled (in the flows way) perforations will be worse. Magnaflow uses pimpled in their perforated core (generally the best in flow) resonators and mufflers. The reason why they still flow better than stock is their exhaust systems are wider diameter (mandrel bends also help). So, if it is a smooth perforated resonator maintaining the same flow diameter than I would leave it alone and sacrifice the extra rasp that you hear in the R.
 

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Which approach was used for the resonator delete?

Do it! In normal mode the car sounds the exact same. In sport mode stomp on the gas and it is a good 15 or 20 percent louder. The R's come without the resonators so basically removing them on the standard GT350 makes your car sound just like an R. I had mine done the first week I owned it and have zero regrets. On the contrary, I love it.
I see on the regular GT350 that there is a smaller pipe inserted in the X pipe. Then it re-inserts in the resonator. Did you keep this neck down feature when you replaced the resonator with pipe? I wonder what the R looks like down there. Does it's straight pipe come off of that smaller pipe necking down from the X pipe? Or does the piping stay the same diameter from the X pipe back? For that to happen, it seems you would have had to get a new X pipe with a slightly larger diameter to accomplish a sturdy slip and weld. They are blaming the 7 hp dynometer difference ( R having more) between the regular and the R on the lighter wheels. But could it be that Ford has contrived a restriction after the X pipe on the GT350 to give the R the edge? I would sure like to see what the R looks like down there before I do a resonator delete.
 

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This is the underside of a GT350R that was displayed at Laguna Seca last August

Thanks Nick. Same neck down. I'll keep things the same but with pipes instead of resonators. I will be guaranteed the R sound and drone control level (assuming the mufflers are the same) and and no less flow (assuming the mufflers are the same).

Update. Off with the resonators (with heat shield they are about 12 pounds or more. Also they are smooth perforated core). Found an installer who got some of the smoothest transitions I have seen coming off of the neck down pipe, besting the stock R. The design also favors seamless restoration of stock resonator set up ( for sourcing all parts used you can ask installer Chris Wilson at Science of Speed Automotive Technologies, in Chandler AZ [email protected], 480-894-6277). First 40 miles of driving impressions: In sport mode, it is as rich in texture as it is louder. The deceleration crackle and pops are more pronounced as well as the 'raging elephant 'sound at medium acceleration. Towards the rpm limit it is more balls out insane. No drone. In 6th gear on the highway it is still (in sport mode) tomb silent. I never drive in normal to report any difference. See the image below (just tack welded on before final TIG welding):
Air gun Trigger Gun accessory Auto part Gun barrel
 

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Hey guys! Anyone unplug the valves yet? Kinda annoying having to put the exhaust in sport every time I start the car. If so, did it throw a code?
 

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