Let me start off by saying thank you to all the guys that take time to post there thoughts on this forum. There is a tremendous amount of good info a newbie can gleen from all of this.

OK...little back ground, I own a 2002 Black Z06. Bought it new, but have only recently gotten the bug to do some mods. This car has never been a daily driver, My BEAST stays under cover in my garage and I bring her out every weekend look for Mustangs, Porches and Vipers to harass.

Well I just got her back from Williams Performance in Mooresville NC (just North of Charlotte). I had Kooks LT headers with cats, a LG G5X3 Cam with 112 lobe, and a Halltech Venom intake installed. I know I could have done the Halltech easily myself, but since Bob and Nick were already removing the twin chrome air intake I already had in the car to install the cam, it made sense. they werent charging me anything to do this.

Also I have BB Bullets on the car. But I also have dynamat extreme and the dynamat pad in the rear, so the interior noise is minimal.

I replaced the stock shifter this weekend with the new MGW shifter.


RESULTS:
The car dynoed at 420 RW HP and 400 ft/lbs torque. I am extremely pleased! She still has street manners but when you step on it she is wild!

Opinion on Mods:
#1) G5X3: Love it! Great race idle, very, very little surge.

#2) Kooks Headers: 2 1/2" catted, 1 7/8 primaries. What a difference they make compared to the stock manifolds. It was really a toss up between the LG Pros and the Kooks for me. The LG's, from the test I have seen, do have more low end torque. I'm sure I would have loved them also, but I just couldnt see the extra money. I'm happy with the Kooks. Iwent with the 1 7/8" because I plan on either putting AFR 205 heads on next, or PP my LS6 heads. I need to do more research on this.

#3) Halltech Venom: Works great, looks great. I have read on the forum about the Venom hitting the hood liner in some cases. I did not have this issue.

#4) MGW Shifter: No mistake here, this is an excellent investment also. Nice crisp shifts. Looks great in the car also.

#5) BB Bullets: I had a drone at around 2,500 rpm BEFORE I installed the headers. That is why I installed the Dynamat, which did help, but did not cure it. Now that I have the headers on, I hear NO drone whatsoever. The cabin is actually quieter with the headers on. I like the BB Bullets.. they really give the car a deep exhaust note, as well as significantly increasing the hp and torque due to no restrictions.


KUDO's:
Bob and Nick at Williams Performance: Excellent work Guys!


I hope this helps you guys that are considering different mods.

Kevin

 

Great numbers, Congrats

I recently had a cam swap done as well on my weekend car. Even living in Chicago with the crap weather the car has seen the road more then ever with the new cam in it. My guess is you will now drive the car more which is always a good thing.

 

I did the cam231/237 kooks headers and magnaflow exhaust and put down 416rwhp after a month i wanted more so added A&A blower kit now it's making 612rwhp but I can say on a nice summer day the car hooks in second gear and moves out. M/T is the best

 

Yea! No kidding! Since I got my Z back, I am finding reasons to run to the store!

 

I was really wondering about the Magnaflow exhaust, if it turned out my Bullets were to loud after the header install. How is the exhaust note. Does it have a deep throaty sound?

Kevin

 

i just got done installing pretty much the same set up but i got the LG Pros with B&B Bullets
it will be nice to see the difference between the headers.

 

Very deep tone. Very mellow with cats, and still not real loud with an O/R X pipe. Some mild resonance in the trunk @15-1700 rpms that's easily fixable. IMHO, they're too quiet for a stock car, but nice with headers, etc.

 

I bet you will make more low end torque then my Kooks without a loss in HP. I doubt you can go wrong with the LG's from everything I have read. Definately post your Dyno results.

Have a great time, and dont embarass too many high dollar imports! Leave some for us!

 

How rude...no exhaust video for us?

 

This thread is useless with out video and sound!

 

I figured everyone had already heard Kooks with G5X3 and Bullets from off of You Tube.

But thats cools, I will get one made up this weekend and post it.

 

Seems to be a nice setup.......

 

What Mods do you have on your car.

 

Thanks!

 

Thanks for the props, Kevin. Im sure you will enjoy the new found power! Thanks again for the business.


Zach

 

Not a problem...you all do excellent work and great customer service. I will be calling Bob soon about putting some heads on.

Kevin

 

No problem. Let us know when you are ready.


Zach

 

really? my 01 made 390 hp/tq with kooks & blackwing. 30 additional horse for a cam sounds low. is this cam a step above stock? asking because im not sure & have seen some cars gain around 60 at the rear wheels with our set up and johnny whoevers cam

 

Nice numbers! Maybe some heads next. Enjoy all your new power.

 

From what I understand, A stock C5 Z puts down about 365 rwhp. A good cam and headers will get you around 60 wrhp.
Most cams that I have seen will advertise a hp but tell you that headers are required to see maximum gain. In another words if you want 60 hp you have to also have headers on. So the 60 hp is inclusive of the gains from the headers.
Im not a engine guru by any means, but I imagine there are cams out there that would give you an additional 60 rwhp on top of your current 390, for a total of 450 rwhp...probably a real big cam with bad street manners. I wasnt looking to lose low end torque and driveability for a huge top end that I would never use. I dont drag race my car at the strip, so I probably will never see North of 110 MPH.

The Cam I am running is an LG G5X3 which I believe is somewhere around a 240/241. I am running with cats (we have emissions test every year here in NC ) which doesnt help. I also am running 1 7/8" primaries. I intend on putting AFR Heads on next, and from what I can tell, the heads will work well with the 1 7/8"..guess I will find out.

The LG website has some good dyno results to compare against. There is one test with an 02 with LG Pros, G5X3 and Bullets that puts down 426.2 (see file 23/111 on there website). There is another one though that puts down 437.5 (file 58/111) with similar set up but doesnt tell you the exhaust system used.

My guess is that test 23/111 has cats and that 58/111 doesnt. But who knows...

Good Luck with whatever you choose!

Kevin