[VIDEO] New 2020 Corvette Visits LMR for a Dyno and Catback Exhaust Install


[VIDEO] New 2020 Corvette Visits LMR for Dyno and Exhaust Install

A brand new Rapid Blue 2020 Corvette with just 20 miles visits Late Model Racecraft in Texas for installation of LMR’s high-flow Catback exhaust, but first, it hits the dyno for a baseline test.

This new video from the Texas tuner shows that LMR can basically install their Catback exhaust system in about a day’s work, not including the dyno tests before and after.

One of the interesting “finds” in this video is that we learn what the top speed of the C8 Corvette is if you have the Front Lift engaged. The Rapid Blue Corvette was lifted by one tech as it was maneuvered onto the dyno, but the tech didn’t lower the car after it was all strapped into place. During the dyno test, the Corvette was speed limited to only 102 mph and as they attempted to figure out the cause on the second run, we see the alert on the Drivers Information Center. After realizing the Front Lift was engaged, the car is lowered back into regular driving posting and then the baseline dyno test is able to be completed.

[VIDEO] New 2020 Corvette Visits LMR for Dyno and Catback Exhaust Install

Next up is the install of LMR’s high-flow Catback exhaust system for the C8 Stingray. A time-lapse video shows the technician prepping the car and then beginning the teardown process to remove the factory system. Then the new exhaust plumbing and mufflers are installed and after ensuring that the exhaust tips are centered correctly, the rear fascia is bolted back on. Finally, the car is started to make sure that it runs correctly and that there are no exhaust leaks present.

We get a few sample revs from the newly installed exhaust and it does sound deeper than the stock Tenneco exhaust system that was removed. The car is then returned to the dyno bay for its post-install test. The Corvette originally dyno’d at 437 rwhp and 419 lb-ft of torque. Following the exhaust install, the new figures were 459 rwhp and 441 lb-ft of torque.

From Late Model Racecraft via YouTube:

We get a Rapid Blue C8 delivered to us straight from the dealership with the intent of receiving our complete exhaust system which includes high flow cats and our Catback exhaust! Our system not only makes these cars sound like true sports car after install, but you also gain a solid 20rwhp and 20rwtq across the powerband.

Late Model Racecraft / YouTube

[VIDEO] Late Model Racecraft Wraps Up Its Twin-Turbo C8 Corvette Build with a Test Drive
[VIDEO] Late Model Racecraft Twin-Turbos Street Speed’s 2020 Corvette
[VIDEO] Late Model Racecraft Shares the Sounds of Their Catback Exhaust



  1. Not sure why the C8 muffler system is so expensive. LMR wants $3,200 just for the rear setup, cats are extra. This system doesn’t come with the valves to change to the sound.

  2. Well, another exhaust system without any heat shielding. I guess if you don’t use the trunk it won’t matter, but I would want some shielding to protect things from heat, and it does get hot in the trunk anyway so without it, it’ll cook back there.

  3. Losing the adjustable exhaust would be a deal breaker for me. You pay extra money to get that feature as a factory option.

  4. Firstly, let me compliment LMR’s marketing department. They’ve got widely distributed exhaust information through various outlets: GM Authority and YouTube direct along with a few star YouTubers. Great. Next, let me compliment the commenters here on the, “…Authority.” They are knowledgeable and cogent. Each exhaust system has advantages and disadvantages. Some want too much money; others take away valving and flexibility. Most seem to offer from 9 to 22 horse power and from about 11 to 22 foot pounds of torque. This test sounded promising from the gate and then we get to the end and, “slipped into,” the equation is the fact that LMR incuded their own Cats. This leaves out the people who want to remain legal in California (not everyone cares) and other jurisdictions which do not allow CAT tampering. Another problem is that it doesn’t compare apples to apples. Instead of comparing the stock Stingray C8 with CAT back only, the test compares a CAT-back with non-factory cats with a stock system. Thus the actual production of the solo cat-back is left out of the measurement. Then the valving is lost. Finally, the heat shielding is discarded. Several systems do take care of shielding and heat soak measurements have been made. The most thoroughly tested is BORLA, which actually has done heat measurements for General Motors. This article would have been fully informative if the author had gone back to LMR to obtain the before and after figures of the cat-back system only on both dyno runs. Prospective customers would then know what they are doing when they compare systems. AF

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