[asthmamax11]

I know this topic has been brushed on over the last 5 years.
*factory exhaust is efficient to over 650whp
*better things to put your $ towards
Etc, etc

What about Heat dissipation from the engine bay ?

Anyone have data showing lower underhood temps post headers on a supercharged setup ?

Last question:
Any before and after dyno of headers on a supercharged setup ?

[KingLT1]

Headers will increase heat under the hood unless you thermal coat or wrap them.

The factory cat pipes are the biggest bottle neck.

One member went from factory headers with new era cat deletes to catless headers and gained 19whp on a 650-670whp Whipple setup.

[JSH]

Originally Posted by KingLT1

The factory cat pipes are the biggest bottle neck.

We checked my green cats last week and they were burnt/mangled, so we scraped them out. It now has only the Kooks AB mufflers.

[KingLT1]

Originally Posted by JSH

We checked my green cats last week and they were burnt/mangled, so we scraped them out. It now has only the Kooks AB mufflers.

not surprised...only the gesi gen 2 cats seem to be holding up on higher horsepower fi builds.

[LT1ornothing]

Originally Posted by asthmamax11

I know this topic has been brushed on over the last 5 years.
*factory exhaust is efficient to over 650whp
*better things to put your $ towards
Etc, etc

What about Heat dissipation from the engine bay ?

Anyone have data showing lower underhood temps post headers on a supercharged setup ?

Last question:
Any before and after dyno of headers on a supercharged setup ?

As King said, front cats are most restricted. If you can score some cheap new era cat deletes, do it. I'm going with 2" SE catless headers. I have seen the dynos and ET gains, and the long tube headers pick up power and torque everywhere on the powerband, n/a or blower. But the gains seem to be more noticeable on blower setups.

[Joshinator99]

It really depends on your power level as the OP touched on. As you crest 650 WHP you’ll start to see soaring OEM cat temps and less efficiency from the engine. That’s about the point where you should seriously consider headers & high flow cats (or no cats… for off road use only, since the EPA is probably reading this ).

[asthmamax11]

Very good info
Yeah definitely getting rid of cats either direction I take

[GAOLDGUY]

Hey Asthmamax11,

We are neighbors and I love your setup. How are you going to deal with inspection? I'm in Gwinnett County. You can take it off-line and message me if you like but I'm sure you never plan to drive it on the road again after you remove the cats. I know the EPA is watching. I will go hug a tree while I wait for your response.

[Jhunsberger]

Originally Posted by asthmamax11

I know this topic has been brushed on over the last 5 years.
*factory exhaust is efficient to over 650whp
*better things to put your $ towards
Etc, etc

What about Heat dissipation from the engine bay ?

Anyone have data showing lower underhood temps post headers on a supercharged setup ?

Last question:
Any before and after dyno of headers on a supercharged setup ?

I cant speak to heat dissipation, but here was my incremental results and mods.

Consider this (more info below): Long tube coated (was already catless which netted me +23/+4), NW 103 TB and big gulp = +34rwhp & +23 tq. Alot of $ for minimal gains.

-------------------

2017 Camaro SS M6

(rwhp/rwtq)
OS = Over Stock
OP = Over Previous Setup

Complete Street Performance / Dynojet

Stock
417/428

Stock Tuned
429/440
+12/12 OS

Whipple 3.50 pulley, LT4 HPFP, LT4 Injectors, RotoFab Dry, Stock exhaust w/ Cats
597/591
+180/163 OS
+168/151 OP (stock tuned)

Previous Plus: NEP Cat Delete Pipes (primary & Secondary)
620/595
+203/167 OS
+23/4 OP

Previous Plus: Borla Atak, Borla Resonator, Kooks 2” LTH coated, NW 103 TB, RotoFab Big Gulp, Granatelli Plug Wires, Gforce AL DS, DSS Axles
654/618
+237/190 OS
+34/23 OP

***This step was very costly and yield little results for the $ spent***

Retuned by EFX/Mustang Dyno
688/632

I went and got it retuned by EFX after talking to them about the bog issue and the torque management. Also there was a rough/weird spot down low i didnt like. Both were taken care of. Perhaps I could next look back and try and match up best 1/4 mile on each setup.

[Joshinator99]

Originally Posted by Jhunsberger

I cant speak to heat dissipation, but here was my incremental results and mods.

Consider this (more info below): Long tube coated (was already catless which netted me +23/+4), NW 103 TB and big gulp = +34rwhp & +23 tq. Alot of $ for minimal gains.

-------------------

2017 Camaro SS M6

(rwhp/rwtq)
OS = Over Stock
OP = Over Previous Setup

Complete Street Performance / Dynojet

Stock
417/428

Stock Tuned
429/440
+12/12 OS

Whipple 3.50 pulley, LT4 HPFP, LT4 Injectors, RotoFab Dry, Stock exhaust w/ Cats
597/591
+180/163 OS
+168/151 OP (stock tuned)

Previous Plus: NEP Cat Delete Pipes (primary & Secondary)
620/595
+203/167 OS
+23/4 OP

Previous Plus: Borla Atak, Borla Resonator, Kooks 2” LTH coated, NW 103 TB, RotoFab Big Gulp, Granatelli Plug Wires, Gforce AL DS, DSS Axles
654/618
+237/190 OS
+34/23 OP

***This step was very costly and yield little results for the $ spent***

Retuned by EFX/Mustang Dyno
688/632

I went and got it retuned by EFX after talking to them about the bog issue and the torque management. Also there was a rough/weird spot down low i didnt like. Both were taken care of. Perhaps I could next look back and try and match up best 1/4 mile on each setup.

Looking back at your numbers, you definitely were not pushing the car hard enough to justify the 103/BG combo. It certainly didn’t hurt you, but a 95/standard Rotofab combo was plenty for your setup. And the headers would have performed even better as you upped the airflow into your motor.

[Spaceme1117]

I am not supercharged; just a 2017 SS with Kooks headers and cats. But the benefits of headers on a supercharge engine will be the same or likely better.

On the stock manifolds and cats, my car made 393 peak WHP and 416 peak WTQ.

With 1 7/8 headers and cats and on the same dyno, it made 421 peak WHP and 408 peak WTQ.

So gained 28 peak WHP and lost 8 peak WTQ. But...

The significant gain was power and torque above 5000 rpms. Both HP and TQ were maintained much better from 5000 up the redline.

At 6500 rpm before headers, WHP and WTQ were 355 and 280 respectively; after headers and at 6500, WHP and WTQ were 410 and 330. That is a gain of roughly 50ish WHP and WTQ in the upper rpm's which is amazing. That is equivalent to a cam swap. These engines just want to breath.

[KingLT1]

Originally Posted by Spaceme1117

I am not supercharged; just a 2017 SS with Kooks headers and cats. But the benefits of headers on a supercharge engine will be the same or likely better.

On the stock manifolds and cats, my car made 393 peak WHP and 416 peak WTQ.

With 1 7/8 headers and cats and on the same dyno, it made 421 peak WHP and 408 peak WTQ.

So gained 28 peak WHP and lost 8 peak WTQ. But...

The significant gain was power and torque above 5000 rpms. Both HP and TQ were maintained much better from 5000 up the redline.

At 6500 rpm before headers, WHP and WTQ were 355 and 280 respectively; after headers and at 6500, WHP and WTQ were 410 and 330. That is a gain of roughly 50ish WHP and WTQ in the upper rpm's which is amazing. That is equivalent to a cam swap. These engines just want to breath.

A good portion of your gains was from removing the stock cat pipes.

Originally Posted by Joshinator99

Looking back at your numbers, you definitely were not pushing the car hard enough to justify the 103/BG combo. It certainly didn’t hurt you, but a 95/standard Rotofab combo was plenty for your setup. And the headers would have performed even better as you upped the airflow into your motor.

I had to drop the E content 10% when I went from the Standard RF to Big Gulp with a 3.5 pulley. It wanted the same amount of fuel as dropping pulley size. Pulley swap definitely cheaper but I like the idea of gaining power through efficiency improvements.

[Joshinator99]

Originally Posted by KingLT1

I had to drop the E content 10% when I went from the Standard RF to Big Gulp with a 3.5 pulley. It wanted the same amount of fuel as dropping pulley size. Pulley swap definitely cheaper but I like the idea of gaining power through efficiency improvements.

Definitely agree (and did the BG myself early on even though it was overkill). I was just commenting on JHunsbergers post that his TB/CAI mods were expensive for the amount of HP he gained, that’s all.

[KingLT1]

Originally Posted by Joshinator99

Definitely agree (and did the BG myself early on even though it was overkill). I was just commenting on JHunsbergers post that his TB/CAI mods were expensive for the amount of HP he gained, that’s all.

Oh, I agree but What isn't expensive on this platform?