Resident LS1 owner and enthusiast here...the 2001-2002 LS1s come with higher flowing stock heads, and if you upgrade the cam, add LT headers, underdrive pulley, cat back and drag radials, you'll have an 11s car for under $5000 in mods. My 2K1 WS6 has only a K&N drop-in, the air lid, and a catback exhaust...I've managed a 12.8 @ 109 MPH down at Atco raceway. That means the car is putting down something like 315 RWHP and 320 RWTQ...or 365 HP / 380 TQ at the flywheel. Totally awesome!
<< The LS1 has 10:1 compression, Vortech, ATI, and Paxton all have kits available for all F-Body's, They range from 55%-65% increase in power, for those guys who like to stay natural, they like to bolt on LS6 heads as they have about 30% more flow <-- thats HUGE and they get close to 11:1 compression, the guys who don't have the $3000 for heads like to trade with guys like me who have a LM7, they pop my heads on and gain 10.8:1 >>
A lot of people get heads from MTI, a popular upgrade is the LS6 intake manifold, which is also included stock on 2001-2002 LS1s.
<< The Previous Motor SC's on the Stangs are super simple to bolt on, my best friend carried over his SC from his 302 to his sportsman 351, only real change is the deck height, the new 4.6 Stangs are another story, their fuel system is returnless for one, so there is tuning involed with fuel Pressure.
As far as their prices in the ATI world the prices are similar on kits for LS1 and the 4.6 Stang's but the stangs are less expensive, The Mustang is the cheapest pony car to mod for on the planet.
As far as the LS1 vs the 4.6, Stock the LS1 will tear it to shreads, it has higher peak and Band numbers. >>
The LS1 aftermarket is a lot smaller and much more expensive than the Stang aftermarket...but to get a stang up to stock performance of an LS1 takes quite a bit.
-= SsZERO =-