Stock '02 Rear Wheel HP

[SANOLS1]

I have no clue

I was told 350 (hp) x 17% ( loss because it was an automatic) = 290.50 is what I was told the rwhp should have been

We ran the dyno and it came up as 313 rwhp.

They did 1 pull and thought the dyno was off

Put another car on the dyno and it pulled with in a 1/2 hp of what the known hp of the car was

They put my car back on and pulled 2 more times with the highest pull being the 313

There were some specualtion about the motor being queer or it was one that went thru quaility control and was brought closer to the proper specs of the motor design, Just a nice cool day? I am not sure but i can tell you allot of the guys who were there were going to look into getting a B&B prt cat back exchaust.

Those numbers are almost exactly what my car ran. I have an 04-A4 coupe. I never got a base run but I've always wondered how much I got out of the Shorties, X-pipe and Corsa Indy exh. I also had a Hurricane intake and the larger 1013 CFM throttle body. Of course the hurricane forced air induction doesn't do much sitting still on a dyno. I was expecting a bit more bang for all the bucks that stuff cost. I've since gotten rid of the intake and added a blower. Weeee...

 

[Bonnell]

My 01 M-6 did 324 rwhp and 344 rwtq with only a Blackwing.
As far as a catback goes I believe the stock one is more than enough for a stock motor. With 414 rwhp going through the stock mufflers and then unbolting them we only got 9 rwhp max. I left my stock catback on till I got 450 rwhp then I switched to a Magnaflow.

This is good info. I was wondering if I needed to replace the old catback when adding LT headers. It is much better to be able to add headers for $1,500 or so than to have to spend $2,800 for LT headers and a catback.

 

[fdxpilot]

This is good info. I was wondering if I needed to replace the old catback when adding LT headers. It is much better to be able to add headers for $1,500 or so than to have to spend $2,800 for LT headers and a catback.

Bonnell, the figures I gave above, 340/354, was with LG Pros, Hi-flow cats, a Blackwing filter, the stock catback and an LG tune. They even said my Blackwing could use a cleaning. They also said I might pick up 5hp from another catback, if I was lucky. I have a GLH 4" Bullet catback now, but it is strictly for sound. With the stock one, you could barely tell the car had headers, except at WOT. Very stealthy, if you like that.

 

[Bonnell]

Bonnell, the figures I gave above, 340/354, was with LG Pros, Hi-flow cats, a Blackwing filter, the stock catback and an LG tune. They even said my Blackwing could use a cleaning. They also said I might pick up 5hp from another catback, if I was lucky. I have a GLH 4" Bullet catback now, but it is strictly for sound. With the stock one, you could barely tell the car had headers, except at WOT. Very stealthy, if you like that.

Tremendous. This is great info. I have watched these forums for 4 years (my daily driver has been my '88 coupe since 2002) interested in ways to increase HP without seriously altering the engine. I like the reliability and good behavior of the stock engine so adding HP with headers, etc. is exactly what I want. My '88 has headers and flowmasters and it really sounds good (much louder than my '02) so I can hear the value of the add-ons. There are no other mods and it has 165K miles and still runs great (it does use some oil but no smoke). I don't like spending money on add-ons and not really know if there is truely a HP gain.

With this info I know that I will take a trip to Dallas and get these headers (the high flow cats came from LG also?). Did you install the Blackwing system? If so, is it simple or does it require alterations? Did you notice any difference with just the Blackwing?

I agree that the stock exhaust is very tame. When I get into it a little it sounds pretty good but I would like a little more agressive sound. It is good to know that the LG headers can give the added HP without having to replace teh entire exhaust system.

 

[fdxpilot]

With this info I know that I will take a trip to Dallas and get these headers (the high flow cats came from LG also?). Did you install the Blackwing system? If so, is it simple or does it require alterations? Did you notice any difference with just the Blackwing?

I agree that the stock exhaust is very tame. When I get into it a little it sounds pretty good but I would like a little more agressive sound. It is good to know that the LG headers can give the added HP without having to replace teh entire exhaust system.

The whole system, headers, cats and 3" x-pipe, is LG. They did the install and tune in about 3 1/2 hours, including multiple dyno runs.
The Blackwing is a pretty simple install, and was my first mod, besides a CAGS eliminator. Just make sure you get the right one for your model year, as later C5s have a bigger MAF, and the connecting couplers must be the right size. I don't know for sure what gain, if any, it gave. But the SOTP feel was a little better, and now I don't have to buy new air filters, just clean the Blackwing. There are obviously other intakes available, and mine was installed 4 years ago, when there were less choices available. It is still one of the "best filter" only intakes, as opposed to those that require new ducting, or cutting up the radiator shroud. Just my $.02 worth.