if thats the most powern from NA engines you might want to look at the Vette forums. those 5.7 LS6's make like 20-30hp from an intake a full exhaust with headers is like 45hp+ for them. not to mention the LSX intake mani which have some big gains and the big throttle body and cam. you can make an extra 120hp EASY+ on those all motor. the parts are expensive but they can really get into high triple numbers very easily not to mention 34mpg on the highway

 

Check the sig. I have one. With boltons your average LSx is gaining around 50whp. Cam, heads, IMs., S/C don't count as bolt-ons.

 

Bullsh*t

 

Yeah I get about 30-31mpg on the highway. You could pull 34 if you kept it in 6th at 55mph on a flat road but who does that?

 

im talking about the zo6 LS6, not the regular LS1.
i'm on some vette forums once in awhile and i see people making 450whp+ all motor. and getting 30-35mpg at 85 mph in 6th.

 

If they got that kind of mileage then why it have an EPA rating of 24-26 highway mpg??

Dude my cousins four bangin' camry barely gets 34 mpg on the highway..

That's a bunch of BS..

 

They didn't use to be. Corvettes had been rated at 28mpg highway for a long time up until the C6 Z06.

It's easy to get that type of mileage because in my car the engine is only running 1500rpm at 70mph. Nothing BS about it. Ask any owner of a 6-speed 'Vette.

 

At those speeds it's more like 25-28mpg.

 

for you i guess. im just saying what i saw haha.

it would be nice to have 6 speed trans swapped into my car.
same gearing 1-5, 6th super overdrive.