Shorty Header / Tuning Question

[chris@borla]

The shorties do not need to be tuned for.

[g-townmach]

How easy did the shorties go in?? Doing install myself soon.

[chris@borla]

Originally Posted by g-townmach

How easy did the shorties go in?? Doing install myself soon.

There is a ton of room which makes the install nice and easy.

[g-townmach]

Is everyone reusing the factory gaskets I assume??

[Clear Image Auto (Dan)]

Originally Posted by JANNETTYRACING

What was They're Baseline numbers and after install numbers.

All LS3s I dynoed are 372-377 RWHP Bone Stock so

Yours are correct, they may be showing Lower baseline numbers and end up where you are now to show a gain.

I don't expect Shorties to do anything on this car, as the Cats are the Restriction not the Manifolds.

Ted.

Here on the west coast we always seem to end up with lower numbers on the dyno. Best octane gas available here is 92. Anyways, bone stock we saw a high of 374.20 HP with an average of 358 on a DynoJet. Those were "uncorrected" numbers. The "Corrected" numbers were a high of 360.31 with an average of 345. Testing the stock replacement hi-flow converters was good for an average of 20 HP to the wheels, "Corrected". Long tube headers gained us another 25 HP to the wheels without tuning. As you mentioned, the stock converters are definitely a choke point. I doubt shorty headers alone, without addressing the stock converters, will make much of a difference. At least with the dyno numbers "Corrected".

[bilydean]

Originally Posted by g-townmach

Is everyone reusing the factory gaskets I assume??

The JBA shorties come with new header gaskets and they are fairly easy to install. (at least mine were)

Dean

[caverman]

Originally Posted by Clear Image Auto (Dan)

Testing the stock replacement hi-flow converters was good for an average of 20 HP to the wheels, "Corrected".

What did you use for the "Hi-Flow" converters. Is anyone making something to replace the factory converters with hi-flow ones while maintaining the factory headers or maybe shorties?

[Clear Image Auto (Dan)]

Originally Posted by caverman

What did you use for the "Hi-Flow" converters. Is anyone making something to replace the factory converters with hi-flow ones while maintaining the factory headers or maybe shorties?

We manufacture our own bolt-in converters as well as "off-road" pipes. We use the metal matrix converter cores. They are 100% stainless steel and extremely free flowing as compared to the stock converters. We TIG weld them in a fixture to locate them exactly every time. Stock flanges to match the factory manifolds are used and a slip fit to the factory or factory replacement exhaust system. They will also bolt-up to any and all shorty headers, as long as the shorty headers are a direct replacement for the stock manifolds. All tubing is 304 stainless steel as well as the factory 2-bolt flange. O2 Chambers are used to prevent codes. Thus tuning is NOT required. I will try to have pictures up on our site tomorrow. Email me direct and I can reply with some pictures.

[Michael_Js]

Hi Dan. No tuning? So obviously no codes, right? I know you guys don't care about strict CA emissions, but do you think that would pass here?

Thanks!

[Clear Image Auto (Dan)]

Originally Posted by Michael_Js

Hi Dan. No tuning? So obviously no codes, right? I know you guys don't care about strict CA emissions, but do you think that would pass here?

Thanks!

No tuning was required for the stock replacement converters or for the long tube headers with hi-flow converters. Once the 3" exhaust went on we absolutely had to tune for it. So, no codes without tuning. At least the way we fabricate our converters.

As for CA, I have lots of customers down there running our long tube headers on other vehicles. To date, in 10 years, i have only had one call to report he failed a visual. I can not guarantee you will pass CA smog, but I have no doubt the actual pollutants coming out the tail pipes will be within specs. But it doesn't matter as CARB has established any cat converter not stock or meeting stock specs, is not and can not be certified. As easy as the headers/converters and specifically the stock replacement converters are to install, you could always go back to stock every few years.

Thanks for your interest.

[Michael_Js]

Thanks Dan!

[SSTony]

Originally Posted by JANNETTYRACING

What was They're Baseline numbers and after install numbers.

All LS3s I dynoed are 372-377 RWHP Bone Stock so

Yours are correct, they may be showing Lower baseline numbers and end up where you are now to show a gain.

I don't expect Shorties to do anything on this car, as the Cats are the Restriction not the Manifolds.

Ted.

I wonder if replacing the the cats with a better flowing cat would be a better gain in HP than doing headers. Sure would be cheaper.

[JANNETTYRACING]

Originally Posted by SSTony

I wonder if replacing the the cats with a better flowing cat would be a better gain in HP than doing headers. Sure would be cheaper.

Trust me, Just install the LT headers and High Flow Cats you will not be disappointed.

[Clear Image Auto (Dan)]

Originally Posted by SSTony

I wonder if replacing the the cats with a better flowing cat would be a better gain in HP than doing headers. Sure would be cheaper.

As I mentioned above, hi-flow converters, (direct factory replacement), yielded 20 HP to the wheels. Long tube headers were good for another 25. So, yes, replacing the stock converters with hi-flows will make give you a nice gain for a decent price.