wvumtnbkr Posted March 23, 2021 Report Share Posted March 23, 2021 I'm looking to lose some weight on the car and want to go with a side exit exhaust. Can somebody recommend a high quality, quiet muffler that holds up to racing? I want a low profile for it so oval is important. Thanks! Rob R. Quote Link to comment Share on other sites More sharing options...
MMiskoe Posted March 23, 2021 Report Share Posted March 23, 2021 Exhaust note tends less sharp but can be either major or minor. Quote Link to comment Share on other sites More sharing options...
Technical Advisory Committee mcoppola Posted March 23, 2021 Technical Advisory Committee Report Share Posted March 23, 2021 (edited) 18 minutes ago, wvumtnbkr said: I'm looking to lose some weight on the car and want to go with a side exit exhaust. Can somebody recommend a high quality, quiet muffler that holds up to racing? I want a low profile for it so oval is important. Thanks! Rob R. Borla is always a good choice. You can find them in oval or round shape. I think @Team Infiniti said they were lifetime warranty too? Edited March 23, 2021 by mcoppola Quote Link to comment Share on other sites More sharing options...
Team Infiniti Posted March 23, 2021 Report Share Posted March 23, 2021 Borla stainless,straight through, glasspack ovals have held up well for us w/ both v6 & v8, yes lifetime, but hold your proof of purchase in a safe place. Not sure they are the lightest though. Quote Link to comment Share on other sites More sharing options...
wvumtnbkr Posted March 23, 2021 Author Report Share Posted March 23, 2021 I don't need lightest. The light part is gonna come from hacking off half of the exhaust. 1 Quote Link to comment Share on other sites More sharing options...
QuaTTro Posted March 23, 2021 Report Share Posted March 23, 2021 23 minutes ago, mcoppola said: Borla is always a good choice. You can find them in oval or round shape. I think @Team Infiniti said they were lifetime warranty too? After trying several cheap smaller resonator things, we went with an oval shaped Borla Turbo XS muffler that is (1) much quieter and (2) just flat enough to tuck up under the car for a side exhaust under the rear passenger door. There are also some cool companies like Rawtek that make some interesting shapes like Triangular resonators. I have one in my other track toy and it helps fit the area under my car better. I believe they sell flat ones too. I was able to get a huge discount on a resonator that had a tiny manufacturing defect too. It's worth contacting them to see what's available (their website mostly shows full exhaust kits but I bet you can buy a component if you call them like I did). Quote Link to comment Share on other sites More sharing options...
scottyk Posted March 23, 2021 Report Share Posted March 23, 2021 1 hour ago, Team Infiniti said: Borla stainless,straight through, glasspack ovals have held up well for us w/ both v6 & v8, yes lifetime, but hold your proof of purchase in a safe place. Not sure they are the lightest though. ^borla xr1 is good for us, lasted 6 seasons now. 2 Quote Link to comment Share on other sites More sharing options...
BollingerChump Posted March 23, 2021 Report Share Posted March 23, 2021 Magnaflow sells some of those on amazon for really reasonable price. Have been happy with ours, though it's a round.. Quote Link to comment Share on other sites More sharing options...
mhr650 Posted March 23, 2021 Report Share Posted March 23, 2021 I managed to kill everything I put on the car until I added Racing Beat mufflers. For what you want to do the 2.5 universal pre muffler would be perfect. They are still very quiet, I was shocked the first time I started my car with just the pre silencer attached to the header it was quieter than any series dual muffler system I had ever had on the car .The housing is made from thicker stainless than other mufflers on the market and the packing is stainless wool instead of fiberglass, it will last forever. http://www.racingbeat.com/RX7-1975-1985/Exhaust-Universal-Parts/16431.html 3 Quote Link to comment Share on other sites More sharing options...
Administrators Bill Strong Posted March 24, 2021 Administrators Report Share Posted March 24, 2021 after listening to you guys at over 150 events over the past 4 years or so, this is my experience. I like this muffler and will be using it on the 1.9 and the 1.6 liter version of the Opel GT. It seems to work well on most cars. use the street version. anything "race muffler" from most companies wont pass CCES sound.https://spintechmufflers.com/300dsc-300scs-300sct-psc-split-case-mufflers/ For my 3.3 liter v6 MR2 I used the Dynomax UltraFlow welded muffler. It was the only one that would last a year of racing while maintaining a quietish sound that would pass todays sound levels. Two in tandem should work at Laguna with diffuser plates welded into the tips. 1 Quote Link to comment Share on other sites More sharing options...
TimS Posted March 25, 2021 Report Share Posted March 25, 2021 (edited) Spintech makes some great stuff. Had one on a peripheral port 13b and a big turbo 13b that worked great lasted for years. Very popular with the drag crowd. Recently bought a Chinese version for my E30 from amazon that is working great too. Edited March 25, 2021 by TimS Quote Link to comment Share on other sites More sharing options...
revvhappy Posted March 25, 2021 Report Share Posted March 25, 2021 I added a Boom Tube tip with mechanical baffles as a side exhaust outlet after a medium-size resonator. It was functional and sounded great on the Toyota inline 6. https://drgas.3dcartstores.com/DR-GAS-UNDER-BOSS-4-TRAP-BOOM-TUBE-TIP_p_63.html Quote Link to comment Share on other sites More sharing options...
TiredBirds Posted March 25, 2021 Report Share Posted March 25, 2021 We run a flat style muffler, it is mounted under the rear seat foot well. We bashed the floor up. Our teammate made the NASCAR style exhaust. It is one of the quietest cars on the track. This one. muffler 1 Quote Link to comment Share on other sites More sharing options...
Administrators Bill Strong Posted March 25, 2021 Administrators Report Share Posted March 25, 2021 2 hours ago, TimS said: Spintech makes some great stuff. Had one on a peripheral port 13b and a big turbo 13b that worked great lasted for years. Very popular with the drag crowd. Recently bought a Chinese version for my E30 from amazon that is working great too. That's awesome to know. If it can take the rotary heat without welds breaking that top shelf stuff there. Quote Link to comment Share on other sites More sharing options...
Gkuhn41 Posted March 25, 2021 Report Share Posted March 25, 2021 We run out the side. We failed at Nelson Last year by 2 DB we put a makeshift turndown on and it passed but we got fumes in the car so we altered it again and just made sound. After we put a spintech on and also put a real turndown on it. @E. Tyler Pedersen was the one who suggested the spintech. No fumes and I dont know what our DB levels are now but we ran 4 days after and @Bill Strongnever came with his earmuffs on and black flag after so I assume we were good....i hope lol. If youd like i can get the model # off ours. 2 Quote Link to comment Share on other sites More sharing options...
gundy Posted March 26, 2021 Report Share Posted March 26, 2021 (edited) 16 hours ago, TimS said: Spintech makes some great stuff. Had one on a peripheral port 13b and a big turbo 13b that worked great lasted for years. Very popular with the drag crowd. Recently bought a Chinese version for my E30 from amazon that is working great too. I have a spintech on my track day Miata mounted ahead of the diff (don't remember the model) and it was very loud, had to put another welded case muffler behind it. the concept is great but I feel like it was a wasted $100. Edited March 26, 2021 by gundy hit send too soon Quote Link to comment Share on other sites More sharing options...
Rodger Coan-Burningham Posted March 26, 2021 Report Share Posted March 26, 2021 (edited) We have had the same 4x9 Magnaflow on the car since 2015 and have always passed sound. Ran on the dyno with and without and saw about 1hp difference. They are about $100. Edited March 26, 2021 by Burningham 2 Quote Link to comment Share on other sites More sharing options...
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