[Sakudog]

Originally Posted by SFV1LE

I like your mods... the engine bay looks great from a functional standpoint and I like how you went with just a 2650, catch cans, and apparently not much more. Keep it simple and you have reliability and low engine temps without a lot of new potential points of failure.

The 93 tune is a good idea too, but I'd be tempted to add a 100 octane tune with it available at every track. I should know this, but do the standard ZL1 tuning tools allow for map switching on the fly?

Yup, super simple setup.

If you can use more than 700 rwhp in a RWD car, let me know how that MOTEC install went In reality, this is ALL the power the car can manage and even then it's going to be slower and more dangerous than a stock one, in the wrong hands.

Yes, I will mix 101 in with 93 at COTA, but not for power, but safety.

[Sakudog]

Originally Posted by DFW_Muscle

I have heard mostly good things about AMP despite the oil filter incident 2 years ago.

Yes, that was a weird situation, that tech no longer works there, they churn out incredible installs and cars, like mine...that's what matters.

[Sakudog]

Originally Posted by kropscamaro16

so why no cage/harnesses yet?

Have a Studio RSR bolt in 4 point and Schrothe ProFi harnesses, but I like to drive the car on the street. I slap all that in for track weekends, takes about 2 hours.

[CBren]

Originally Posted by Sakudog

The photographer added a lot of contrast, but the color is very dark blue, it's called Riverside Metallic. Thanks!

Appreciate it brother!

[Heartbreaker]

Originally Posted by Sakudog

(Scroll to the bottom for pics)

Recently had a set of Kooks 2" long tubes headers installed to complement the Magnuson 2650R to build a reliable/safe track-focused power band. The results were exactly what I wanted, the car makes ~700 rwhp through the automatic and the power delivery is super smooth. Nothing tricky about the setup, just a 2650R on an all-stock motor with LTs, 93 octane, through the A10.

All of that was great, but it was just too damn loud for me, my neighbors, likely any track with any type of noise restriction, etc. To maximize my enjoyment out of the car, I needed to make a change. After some careful research, I settled in on adding a Magnaflow X-pipe muffler where the factory X-pipe was, replacing it with the Magnaflow X. I kept reading people trying to resonators to remove the high pitch rifle shot sound when mixing NPP and LTs but the effect being minimum on DBs and tone.

https://www.magnaflow.com/products/1...rmance-muffler

The end results are FANTASTIC and exactly what I wanted. The car has a mild startup, the ear-piercing BARK when the car roars to life is completely gone. That sound was okay I guess when the car was 100% stock, but after the LTs it was really difficult to live with for me and my 3 year old.

The car now has a much more mellow note and until you add in a lot of throttle, the car is actually really reasonable. Once the exhaust gas picks up speed, the X-Muffler can do less to lower the DBs but the tone is still deeper. So the exhaust, under load still gets VERY loud, louder than stock. However, now you can take a drive in the car and have a regular conversation with a passenger, listening to music or talk on the phone no problem, actually better than stock in that regard.

I realize some of you WANT your cars to be very loud and you enjoy that part of your car. Coming from an 1100 rwhp TT ZL1 and a Buick Grand National before that, loud and fast don't go together for me like it does for some of you, that's a personal thing.

In addition, now that I'm a total track ratt, listening to an ULTRA loud car @ 100% throttle for 20 minutes a day, 6 times a day, isn't fun, even with my helmet on.

(Some may ask, why to keep the stock NPP muffler and I'll give you my 2 reasons. #1 the aerodynamics of the car is affected slightly by removing the suitcase muffler and adding aftermarket mufflers. A void is created where the muffler once sit, disrupting airflow. This may not be an issue for you on your track, but COTA is a high-speed track and after 130mph to about 160mph the rear bumper shakes violently as air pressure catches the bumper cover and tries to pull it off, buffeting it and making it shake, causing lift and slowing the car down. Once you go away from that muffler, you end up adding a diffuser to cover the gap it left, that was a bunch of steps I didn't want to take to make my car even loud. #2 "weight savings isn't there" the stock NPP muffler by itself actually doesn't weigh that much, weight savings is typically negated w/a stainless system, unless you're going to a FULL race setup, which means no muffler and as you could guess, that isn't going to work for me, most track, my wife, child or my neighborhood. )

I hope this helps some of you who, like me, thought the exhaust note was TOO loud for Track use or just wanted it to be quieter but still enjoyable.


Start-up videos:

Outside



Inside



Partial throttle, higher RPM, light pulls:

Have you had the opportunity to get a dB measurement at a track with this setup? NCM has a 103 dB limit. Thanks

[Sakudog]

Originally Posted by Heartbreaker

Have you had the opportunity to get a dB measurement at a track with this setup? NCM has a 103 dB limit. Thanks

No sorry, no information like that and my "home track" COTA, doesn't enforce a dB limit. I do believe the car is just slightly louder than stock at FULL TILT, but the tone is much deeper than stock and "rings out" an LOT less. Next time I go to my favorite little Club Track (The Driveway Austin) I'll have them check.

[Heartbreaker]

Originally Posted by Sakudog

No sorry, no information like that and my "home track" COTA, doesn't enforce a dB limit. I do believe the car is just slightly louder than stock at FULL TILT, but the tone is much deeper than stock and "rings out" an LOT less. Next time I go to my favorite little Club Track (The Driveway Austin) I'll have them check.

I will have this same muffler put in tomorrow morning. I have to tone down the car due to NCM Motorsports Park sound restrictions. I will run 104.5 to 105 DBs at WOT. I’ll let you know how it works. HPDE coming up on July 18 & 19.

[Sakudog]

Awesome, what other Exhaust modifications do you have??

[ZL1 1LmE]

Originally Posted by Sakudog

How did you fit the seats? With BK seat mounts

Is there a premade console? Yes, GM offers it.

and what did you do with the airbag light? Ignore it, very tiny on the dash.

Any idea of the weight savings by going to the aftermarket seats? thks

Also love the sound of the car.

[Heartbreaker]

Originally Posted by Sakudog

Awesome, what other Exhaust modifications do you have??

RotoFab, ported TB, 1 7/8 ARH, highflow cats, x pipe and eliminated the resonators, into stock suitcase. Until tomorrow...

[IneedAZ]

Anyone know how that magnaflow holds up to higher hp at wot? Will the insulation blow out?

[Grumpy1]

Like the wheels......What brand and specs?

[Heartbreaker]

Originally Posted by Heartbreaker

I will have this same muffler put in tomorrow morning. I have to tone down the car due to NCM Motorsports Park sound restrictions. I will run 104.5 to 105 DBs at WOT. I’ll let you know how it works. HPDE coming up on July 18 & 19.

Update. Muffler installed same as the OP. It is noticeably quieter. Also, it takes the “raspy” out of the exhaust note. When I go to NCM I’ll get a sound check and compare it to the 104-105 I used to hit at WOT out of turn 3. If you want to lower the DB level of your exhaust this works. TP

[Joshinator99]

Thanks to @Sakudog for posting this up! I just added 2” ceramic coated Dynatech headers and high flow cats and I feel the same way. It’s just too damn loud, even with the Resonated Touring AWE exhaust. I’ll have my shop weld this Magnaflow in too.

Thanks again!