deaguero

I just got the before and after Dyno runs from installing Floored Fabrications short headers. Before Dyno = 427 RWP HP After installation 461 RWP HP. I'm going to have Victors TB installed tomorrow and hope for another 25 HP hopefully getting me to 486 RWP HP. I'll probably install a pulley and Dyno the setup again. Thanks Chiromikey and Chris!!!

Jrocket

Nice job.What dyno was this,the numbers seem very high for a stock car?Any pics of the headers?Are they a true bolt in header or do you have to modify the down pipes and cats?

ROCKETW19

ya 427 stock is pretty high but even if it is high the 34 RWHP gain is crazy for shorty headers. what are kleemanns long tube hp gain?
i got close to 50 RWHP on my supersprints but that was long tube and 100 cell cats.

BenzoBoi

oh rly???

headers alone and that much gain? interesting...

OzE55

Can you show us photos of the headers and dyno graphs?
Thanks

stevebez

Are these equal length shorty's ? Direct OEM swap without welding ?

Pics pleeeez!

suicidal4life

A quick google search and I found these www.flooredfab.com/mepepr.html

BrianS

I was just looking at the Evo headers too, but $3000 vs $1800 peaks my interest. Are the Evo headers that much better in design and quality? Does anyone know the approximate gains with Evo headers only?

vrus

Hey Phil.. Very nice !! Hope you like the TB kit.. Enjoy!

deaguero

Pics to follow as soon as I get the car back from the TB installation!

stevebez

The pic shows a header that looks roughly like the Renntech unit... what I meant by equal length was equal length tubes leading to the collector from each cylinder.... pretty impressive gains it sees from the nline dyno plot...

Anyone know what the size of the primiries are on the stock setup, is it 1.5"??? I think this system has 1.75" primaries??? nice... guess thats why very top end is better.

What size is evospot primaries? I would have got Evosport but they dont fit RHD car...

305-E55

Nice numbers with the Supersprints, I also gained close to those numbers with the same headers.I love the sound that the Longtubes make!

ROCKETW19

yes sir everwhere i go people ask about my exhaust, specialy the dealer.

enzom

What's the installation time/charge on these?

enzom

Whenever I see gains like that from shorty headers, I can't help but wonder if someone isn't screwing around with the data, e.g., SAE for the base vs. uncorrected for the post-installation run. Not that I have any reason to think the gains are bogus. That is pretty amazing for shorty headers. Congrats.

Jrocket

Im not trying to ruin your thread here,but those gains are hard to believe for that style of header.IMO

Vadim @ FD

I agree. The graph looks strange. I have dynoed a few 55s and none of them looked like this.

As far as header. I would not call it as such. It is a log style manifold. A little better than stock, but not 25HP worth.

ROCKETW19

25hp? his numbers = 34RWHP gain! i could see it as 34 crank HP.

mbenzman

Anyone stripped the heat shields from the stock manifolds? I imagine them looking just like that.
The secret is revealed in this quote from their website.
"All inlets are 1.750", flush welded and radioused. The inlets are also oversized to allow for ported cylinder heads and it provides an anti reversion effect."
Anyone know what "radioused" is? maybe that's the trick.
I really would have to see this one to believe it's that much of an improvement. But tickled to death for you if it's true!

stevebez

Its the primary diameters that give the very top end performance - although the claims sound pretty wild ... then again the stock unit is complete cr*p.

What does Renntech claim for theirs? designwise its very similar and as vadim said its not really a header but log manifold... tough to think there is that much restriction in the stock unit that this log unit can add 35+ hp... so thats 8% - a complete front to back freeflow system would do well to achieve that performance improvement.

Best bet - take it to independent dyno or the track...

komp55

These things aren't even really headers. The driver side has the front three cylinders going in at a 90 degree angle into the plenum and then the plenum enters the last cylinders tube at a 90 degree angle as well. The passenger side isn’t any better – the two inside tubes although they look slightly curved don’t have enough angle into the plenum to flow correctly. This is death to performance. As someone else noted, these aren't much different than the stock log manifolds with the heat shielding removed. I question the claimed gains.

chiromikey

i'm not certain but iirc, phil told me he was also replacing the oem cats with high flow units.

Vadim @ FD

If that is the case, than IMHO that is where the majority of gains came from.

chiromikey

don't know that i would agree with the "majority" of power coming from the high flow cats instead of the log headers but i'll agree they're worth a measurable amount.

rflow306

Removing the primary cats from my experience on yields about 10 rwhp. So I doubt high flow cats will gain any more.