I have a H/C/I 383 6 speed and on a mustang dyno i put out 490 rwhp with a stock ls6 intake get a bigger one and youll be around that 550 mark and i get around 300 miles to the tank. I say ls6 is part of my H/C/I because a 2000 came with a ls1 intake and friend got a 102 and gave me his ls6 intake

 

Nitrous setups usually make for good street cars.

I have a c/h/n2o setup thats at 540rwhp now and it drives like stock.

440/405 on motor and 540/590 on spray. The power is there when I want it, and not when I dont. Still have a very street friendly car that I do DD in the summer time.

I have plans for a LS3 next year that will have a similar setup as to what I got now.

 

i just made 1036.2 rwhp and got 20mpg on the way home from the dyno... it can be done. this is with a fully built 408, and a 91mm turbo. yes there is "lag" but thats what the 408 is for

 

This is Lou: Wow! sounds like an awesome car!

http://www.youtube.com/watch?v=6yqxhlLelTE

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DD street car with good power? Nitrous, period.

Run your exhaust out the back, go to a tad higher gear if you would like... Hit it with a 150 shot.

 

that's my plans!!

 

I feel like everyone that says turbo lag is horrible has only experienced a bad turbo setup. Whether it be because of an improperly sized impeller, an oversized A/R, or a crappy turbo. With all the tech we have now lag can really be minimized. Quick spool valve, ceramic impellers, ball bearings... of course it's extra $ but turbo's are fantastic if they are setup correctly. Raised the hair on my neck at even 3000 rpm. And it was a budget turbo build.

 

No lag here. I'll be dropping my rear end ration down to a 3.08 by end of year due to my calculated trap speeds and extra boost by end of year. If I had a 6-speed in the car like it used to have.
1. It'd be in pieces
2. I'd probably get 26-27MPG highway with me tuning for mileage.

I drop the boost down to 10PSI on the street with my MT Radials II's.

 

Ill have to find the thread but if i remember correctly there is a guy on here that is twin turbo 6 speed with 3.08 gears and recorded 32mpg. I highly doubt that is with seeing any real boost but impressive none the less.