Unlocking the stock ECU - Page 2 - Dodge Challenger Forum: Challenger & SRT8 Forums
SRT Hellcat 6.2L Supercharged (2015 - ) Would you like the BLACK KEY or the RED KEY?

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post #11 of 14 (permalink) Old 05-08-2018, 08:19 PM
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Originally Posted by gixxer160 View Post
Getting rid of the cats isn't about HP gains as i know that the current cats flow very very well. It's about noise level. The cats remove a few Decibels for the exhaust note and I like my cars to sound loud. My Ideal setup would be like my other cars and truck, long tube headers no cats and twin AtAt 2.5 Aero Turbine mufflers straight out to 5" tips. However I feel this would kill my warranty, so i am gonna hold off for a while
Mine without cats was fine at hwy speeds and was noticeably louder around town, sounded pretty good. You would probably like it I am guessing. But, in the morning at 7 am it would wake the dead so I had to keep the garage door down and start it, it was frickin loud. I had to wait a few for it to idle down some, open the door and scoot out of the subdivision knowing I woke a few people up. Probably would be the biggest bang for the buck to do with the mini-cats from Bigdaddys and leave the nice, factory exhaust system intact. Long tube headers would be of no use as far as sound if going catless, and they don't produce any power gains on a stocker or even some 9 sec cars like Lindas, so save your money there..
No PCM changes needed, the PCM would never know the difference with the mini cats in there I suspect. No service engine lights came on. If you like the catless sound, you might like the LMI intake as well. The supercharger whine can be intoxicating but i am over it personally.

2009 SRT 426 N/A Automatic, CA, headers, Corsa exhaust, 8.8 with a 3.08, 90mm TB, More.
11.64 @ 119 on the motor with drag radials.

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post #12 of 14 (permalink) Old 05-09-2018, 07:45 AM Thread Starter
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I know how loud it can get. I have included a pic of the exhaust systems on my other cars and truck. Like you said it can wake the dead.
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post #13 of 14 (permalink) Old 05-09-2018, 08:33 AM
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post #14 of 14 (permalink) Old 06-24-2018, 07:24 AM
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I know how loud it can get. I have included a pic of the exhaust systems on my other cars and truck. Like you said it can wake the dead.

I had to chuckle.... many years ago the Y pipe flanges broke on my little 69 318. Had to remove to weld em up at work, but still had to get to work. So I aluminum foiled anything important near the output of the exhaust manifolds (like starter cables..). Geese talk about LOUD plus I had to back out of the driveway at 6 am and climb a 1/4 mile long grade. I am sure my neighbors loved me. (smile).


But the loudest engine I've ever heard was an Alison V12 set up at EAA's airshow on a dyno... some where around 1700 cubic inches, little 5" long shorties one on each of the 12 cylinders... he'd work it to 100% power and take off rpm on the dyno.... Now that was LOUD.... I mean seriously LOUD! Likely 120 Decibles or ???... But it was sweetest sounding engine I've ever heard! (Yea you have to be an engine guy to appreciate it)

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