I want to have a vortech sc installed but I do not have my headers or exhaust installed yet. If I install them after the supercharger has already been dyno tuned, will I have to go back and have it re-tuned? If that's the case then I'll just hold off on installing the vortech for now. On that note, which headers and exhaust work very well in conjunction with the vortech? And of those you recommend, which ones actually have carb#'s?

I also want to get that pulley that enables the sc to make 9 lbs of boost. I checked the vortech website and I could not find it. Where do you guys get that pulley and what is it called. I've seen it called the 3.19 or the 2.something but i am not 100% sure. Your advice is appreciated.

 

yeah you'll probably want to retune with the headers and exhaust. It'd probably just be a minor tune though to richen things up half a point or whatever

it's the 3.12 pulley. If you call vortech and tell them what kit and car you have, they'll know what you need and ship it to you.

IMO just about any exhaust will work well with the vortech except probably for dual 3 inch exhausts simply because you won't be running 700whp with your setup. The exhausts that give more power up top will likely take away power down low, so you gotta figure out what you're willing to trade off.

even something like a nismo which is a 3 inch exhaust and uses two cats and a Y pipe is going to still put you in a much much better exhaust position than single turbo guys who are running a single 3 inch exhaust from the turbo back.

any headers should work better than stock. I'd recomend getting them ceramic or jethot coated though. The crawford is going to be the best, but cost 2x as much for the parts and labor

 

Thanks for the input sentry65, I'm gonna have to copy and paste your entire post and save it for later. Hope you don't mind.

Oh and I checked the link in your sig. Wow you have a lot done to your car. How much do you think your cost of upgrades is so far? And how long have you been building your G? It seems pretty well done.

 

I don't mind, actually I have a 350z. Been modding it for a little over two years now. I've spent more money on mods than the car itself. Stuff adds up fast, but I really like how it drives and looks and that's why I keep doing it vs just buying a different car like a viper, Z06 or porsche in the first place

 

According to past-post(s) experience and Stillen's advice, you don't want to install headers with a (Stillen) supercharger. Power is lost without backpressure, so a factory exhaust with a (Stillen) supercharger will yeild greater HP over a free flowing exhaust system.
[Stillen Header installation manual] - "Note: The addition of headers to a Stillen supercharged Z/G will adversely affect the performance of the supercharger."
http://www.stillen.com/product_files...0m_508350s.pdf

One can only assume the greater backpressure of factory exhaust to be advantagous to other supercharger models as well.

My Stillen Headers and V2 Exhaust has just arrived. I question purchasing, and now spending the 12 recomended hours installing headers now that supercharger dreams are dancing in my mind.

 

the stillen kit is very different than the vortech

adding headers changes the powerband curve. Headers primarily add power in the midrange and up top while possibly losing some low end power. In the case of the stillen, losing a little bit of power might make a bigger loss in low end power than the added power up top makes because the stillen isn't very good at the extreme high end. Stillen's primary market are daily driver people who want more power under 5000 rpms

headers help the vortech SC though in most cases. It kinda depends on if you have cams or test pipes though

it's an exhaust velocity issue.

 

so does that mean if i get headers i have to get cams and test pipes as well? i wasn't planning on getting those because of problems with getting the car smogged plus the level of noise might be too high. i was only planning on getting exhaust and headers.

 

well when you have a fully open exhaust with test pipes with a supercharger, you'll start getting some rasp and it'll be extremely loud.

As far as power though, you'll really start losing a lot more low end torque in exchange for upper power with a fully open exhaust. It won't be drastic, but most people with cams and headers and test pipes usually end up switching back to cats

 

I plan to get a Stillen exhaust. I'm doing to this for a few reasons: less psi running through the engine, lower EGT, more power.

 

the stillen is a good exhaust

 

does anyone have any opinions on the "HKS hi power" exhaust? i heard it's quiet at low rpms where you want it to be quiet but loud in the uppers where you want it to be loud...

here is what it looks like:
http://www.i-m-racing.com/hksduhititex1.html

 

I would suggest having the headers and exhaust installed before the vortech install. The passenger side header is easy but the drivers side sucks. Especially if you have a SC installed. With out the vortech installed it would be SOOO much easier to install them. If not you at least have to remove some of the charge pipes and then work around the charger. As for tuning, you dont absolutely have to have the vortech tuned after install. The kit is pretuned pretty well. So you could install it and drive around then have it tuned after the headers and exhaust are installed. But I say do it all at once. And yeah the stillen exhaust sounds great with the vortech.

 

I'm staying with the 8 psi pulley (for now) and stock cats and headers. I only intend to change the exhaust. I have a tune, but it is still very coF.nservative (high 11s to 10.2 at redline). Do I still need a tune for just the exhaust? I wouldn't mind leaning things out about .5 A/F.

 

should be fine then

 

I Have The Vortec And An Exhaust As Well And Im Planing On Doing Headers And A 9lb Pully Up From 6 Lbs Very Soon Are The Headers Worth Doing?