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gutting the OEM is fine if you are "happy" to make an irreversible modification to your OEM parts...
This. Really not my cup of tea at all and I’d avoid a car that’s had it done.
But to answer your question, there’s no reason not to...
A gutted GPF is not a “resonator”, so unsure where’d you get that idea. I imagine they flow horrible as the exhaust hits a flat plate and fights two exit paths.
What are you trying to fix with your car and this mod? It will increase volume.
This. Really not my cup of tea at all and I’d avoid a car that’s had it done.
But to answer your question, there’s no reason not to...
A gutted GPF is not a “resonator”, so unsure where’d you get that idea. I imagine they flow horrible as the exhaust hits a flat plate and fights two exit paths.
What are you trying to fix with your car and this mod? It will increase volume.
To TXshaggy: Cargraphic is a good german company that is often refered in this forum. They sell a product that mimic the oem oap at big$ and without heatshiels ( separate option $ ). They promote this design saying their product match the sound specific vehicle brand. Fot them this "resonator" is a plus.
To TXshaggy: Cargraphic is a good german company that is often refered in this forum. They sell a product that mimic the oem oap at big$ and without heatshiels ( separate option $ ). They promote this design saying their product match the sound specific vehicle brand. Fot them this "resonator" is a plus.
Yes, well aware of that brand. Don’t see any where where they call it a “resonator”.
Those Cargraphic OPF deletes with the cannisters still on them are puzzling to me. What is going on in there exactly? Anyone have these and have a photo of what's inside? They call it a 'mixing chamber' but unsure what it's mixing.
Interesting they are also citing power gains when I've read testing elsewhere claiming power gains are negligible / borderline unreadable (of which I still find hard to believe given there was a giant blockage in there prior, you'd think freeing it would afford you something).
Those Cargraphic OPF deletes with the cannisters still on them are puzzling to me. What is going on in there exactly? Anyone have these and have a photo of what's inside? They call it a 'mixing chamber' but unsure what it's mixing.
Interesting they are also citing power gains when I've read testing elsewhere claiming power gains are negligible / borderline unreadable (of which I still find hard to believe given there was a giant blockage in there prior, you'd think freeing it would afford you something).
I suspect that the ones w/o the. flow optimized filter are simply a clone of the OEM "defiltered" - I hope the flow optimized ones are better - as I just ordered a pair w/heat shielding to replace the Soul ...
Looking for any recommendations on which GPF delete to use w/stock mufflers for a new ‘21 GT4. Just looking to remove the restriction and enhance sound a bit, I’m not looking to go crazy modding.
fabspeed, soul, akra, others? Any pros and cons vs all of these?
any vendors there with a good shop in Houston Tx area that can put a deal + install together?
thanks
@jd-woodlands I just had the Akrapovic Link Pipe set put on, kept the OEM Muffler, and its purrs. I'm not one who likes LOUD and Obnoxious droning exhaust sounds. With the exhaust button depressed (lit), you'll have a bit more low frequency bark at idle and when just taking off from a stop. Through the mid range my butt dyno confirms throttle response feels free, less constrained, bit more audio from the engine but nothing obnoxious. As you pass about 3,800 RPMs on your way towards redline, there is a significant increase in volume, again mostly low-mid range frequencies. Going through an underpass, covered area, WOW; the bark is intense. Very pleasant.
If your familiar with the 991.1 PSE on their normally asperated (NA) engines, this mod to the GT4/Spyder is good, but its not 991.1 PSE, NA good.
All in all I'm happy I made the investment. As @dnimi123 mentioned, call Eric at Supreme if you want the Akrapovic.
If you want OAP's you best get them ordered soon. EPA's coming down hard on the aftermarket companies and to top it off, supply chain and raw materials issues/shortages are happening and will eventually hit these manufactures. It's a double whammy of sorts. The C6 & C7 Corvette guys have been feeling this EPA pinch for a couple years now...
Still waiting to hear back from Soul as to when their over-the-axle OPF delete pipes will be available - maybe someone else will have better luck trying to find out.
03-31-2021, 03:23 PM
