Posts: 88
Joined: 12/7/2003 From: United States Status: offline
Although I am a C5 Vette driver, I know a little about what can be done. You can put on a smaller pulley which will give you more boost. That seems to be the most common mod. Good luck with your purchase.
By the way, I have a client in Chicago and have been to Naperville. Your town has one of my favorite restaurants, which is Rosebud's. They serve some of the best Italian food I have ever had.
You'de pick up some hp with a good tune...but you wont need it. You can get a chip made specifacally for an 03 cobra with cai, exhuast, pulley, and chip. But I still dont think your af would be lean...the 03 comes with a very capable fuel system, so as long as is maf is working properly, it shouldnt run lean at all.
oooor you can go to upr.com, and I believe a few other people have the, and buy a VENOM kit, includes a offroad X maga or flows cat back, custom burned chip, custom s/c pulley, cai, and a few other things, and I guess with this you'll be pushin 490ish to the wheels, and runnin 11's with tracting, btw the kit is 1k you would be a fool not to buy!
So what would a blower pulley, underdrive pulleys, intake, and no mufflers with cats get you?
damn this is an old post....but i cant beleive it missed this...underdrive pullies on a supercharged car would slow the blower down, and you would lose losts of boost
If you want around 700 hp with an '03 cobra, you might have to do the following: add a smaller pulley, exhaust, MAF, chip, air filter, throttle body etc. which will get you around 450-500 rwhp. However, in the recent issue of MM&FF, they revealed that the stock eaton m112 blower maxes out at approximately 500 rwhp. this could be a problem for you wanting to make 700 hp. A sensible decision could be to add nitrous, a kenne bell blower or a procharger to arrive at 700 horses. then keep in mind the tuning problems, fuel requirements and smart octane levels to prevent detonation. Hope this Helps.
The most common mods are CAI, mid-pipe,catback,upper and lower pulley, and ported Eaton.
This will get you into the 500 RWHP range. After that, you have to start changing components in your fuel system to support the added power. Bigger injectors, MAM, etc.
With all this talk about adding so mush more horsepower and torque started wondering about the drive components. I heard that the half shafts in the Cobra's are weak and it doesn't take a lot more torque from the original torque to snap them. Has anyone run across this? Also if this is the case, has anyone swapped them out for a stronger pair? Also does the Cobra come with body stiffeners? If not, might want to look at that too.
I have not replaced my half-shafts personally, but I know people who have. But they also run their car about every weekend at the track. Anytime you launch at a moderately high rpm with the IRS, you run the risk of it.
I know that quite a few places are starting to see stronger after market ones.
I don't know of anyone who has done that yet. But a couple of guys in my club are talking about full length weld-in sub-connectors. But the reason they were planning it was for making the chassis stiffer for improved handling.
I have also read numerous posts at other places where the owners were putting down way more than my car(aftermarket blowers,etc.) and had not experienced that problem.
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modifications for the 03 - 
