[Fstlane]

Can anyone tell me how much power can you make with the LT4 before the stock exhaust restriction becomes an issue.
I love the sound of the exhaust after installing ARH long tube headers,
But I also love new tires and wheels....Can someone share your experience?

[JSH]

Originally Posted by Fstlane

Can anyone tell me how much power can you make with the LT4 before the stock exhaust restriction becomes an issue.
I love the sound of the exhaust after installing ARH long tube headers,
But I also love new tires and wheels....Can someone share your experience?

You ask about the stock exhaust, but then say you've installed LT. So, are you asking about power before or after LT install?

The stock exhaust is a restriction from the get-go; thus, headers are one of the top hp/mod

[PowerDemon]

I think he means the catback if he already has longtubes.

[L78toLT1]

Originally Posted by PowerDemon

I think he means the catback if he already has longtubes.

If this is the case, he should be good to go unless he's looking to make crazy i.e. 1000+ hp

[clg82]

There are members on here running 700+ to the wheels on the stock exhaust ie: all for cats.....

[laynlo15]

My 16 SS made 770 on complete stock exhaust with 2300 Maggie. Ran 10.00@139.

[NG329]

My car is stock except for the GM Flex Fuel kit and a K&N drop in filter. I expect my car to make anywhere from 600hp - 620hp at the wheels with the tune that it's currently running. I'll be heading to the dyno when the weather gets nice.

They just passed some law in NY that you cannot run modified exhausts. You can be fined or serve up to 30 days in jail. It's nuts.

I still might throw headers on tho. hahahaha

[Fstlane]

Yes I am talking about the factory exhaust ....stock everything.

Seems the Chevy Engineers must have had a pretty good design given they can get 590 HP to the rear wheels. Generally there is room for improvement, and before I drop 2.5K on ARH headers I just wanted to know what you all have been able to do.

I will move to the headers soon......but was wondering how others have done.

[Drnick]

Originally Posted by NG329

My car is stock except for the GM Flex Fuel kit and a K&N drop in filter. I expect my car to make anywhere from 600hp - 620hp at the wheels with the tune that it's currently running. I'll be heading to the dyno when the weather gets nice.

They just passed some law in NY that you cannot run modified exhausts. You can be fined or serve up to 30 days in jail. It's nuts.

I still might throw headers on tho. hahahaha

Wow, so how do they enforce this? And how is a LEO to know a stock from
Modified, other then noise it emits? PS another reason to leave NY!

[NG329]

Originally Posted by Drnick

Wow, so how do they enforce this? And how is a LEO to know a stock from
Modified, other then noise it emits? PS another reason to leave NY!

I'm not sure how they'll enforce it but the exhaust industry is under attack.

https://www.news10.com/news/ny-news/...s-into-effect/

[Fstlane]

770Hp to the wheels is respectable!

[Mac7504]

Originally Posted by JSH

You ask about the stock exhaust, but then say you've installed LT. So, are you asking about power before or after LT install?

The stock exhaust is a restriction from the get-go; thus, headers are one of the top hp/mod

That's interesting because from what I've been reading the stock exhaust is not really that restrictive as the gases can contract and expand enough through the pinched section. I will say though, it does bother my and now sure why they would engineer the setup that way.

[arpad_m]

Originally Posted by clg82

There are members on here running 700+ to the wheels on the stock exhaust ie: all for cats.....

Originally Posted by laynlo15

My 16 SS made 770 on complete stock exhaust with 2300 Maggie. Ran 10.00@139.

Originally Posted by Fstlane

770Hp to the wheels is respectable!

735 rwhp here, stock exhaust with Kooks headers, no appreciable restriction

[CW3SF]

Originally Posted by Mac7504

That's interesting because from what I've been reading the stock exhaust is not really that restrictive as the gases can contract and expand enough through the pinched section. I will say though, it does bother my and now sure why they would engineer the setup that way.

Read Ted Jannetty posts (JRE Racing). He has built more ZL1s than most people have laid eyes on and he said that the stock manifolds are THE biggest restrictions on the LT4.