what should be the first mod....??
How much money you got? 
A higher stall converter should be on your short list, as should be long tube headers (if emissions testing isn't a prob in your area) with either y-pipe/catback or true duals. Before you start modding your car, set a clear goal on what you want out of your car (ie....fast as hell at all costs or powerful daily driver that's liveable) so you don't end up doing things two or three times. You also need to read this:
https://ls1tech.com/forums/new-ls1-owners-newbie-tech/361959-so-you-wanna-fast.html
A higher stall converter should be on your short list, as should be long tube headers (if emissions testing isn't a prob in your area) with either y-pipe/catback or true duals. Before you start modding your car, set a clear goal on what you want out of your car (ie....fast as hell at all costs or powerful daily driver that's liveable) so you don't end up doing things two or three times. You also need to read this:
https://ls1tech.com/forums/new-ls1-owners-newbie-tech/361959-so-you-wanna-fast.html
i agree with above. set a goal. a cam was my favorite upgrade, but requires steps to get to that point. you should consider tuning ( buying a package such as hptuners or paying for a tune) modifying anything will benifit most from a tune. i would say torque converter for an automatic, along with a lid and exuast. you will learn quick that you can spend a lot of money fast. just make sure to research everything you will purchase. ask questions and make smart decisions. there are a lot of things on the market that are bogus. just read and read more. this is by far the best forum on the internet. so if you have questions just search. 99% of the time it has been covered. good luck
This may sound stupid but the first thing I did was an air-lid and MAF and I noticed a difference, then I did gears and noticed a bigger difference, when the guy reprogramed my computer to adjust for the speedometer he deleted the torque management. I was completly satisfied with the prefoformance with my car and wanted to spend no more money and waist any more time on mod's so then I bought Headders, cat back, clutch, LCA's, Torque arm, 224/224 cam and springs, injectors, wheels & tires. What can I say, I have an addictive personality, my girl friend barely minded that I spent her engaugement ring money too...... hummmm
TECH Regular
Joined: Mar 2006
Posts: 436
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From: Boston/Bahrain
is it completely stock? like the guys said set a goal so you know what your mods should be... do you want all out speed, or a fast daily driver etc? or maybe youre just looking to modify the looks?
Most cases youll need a few basic bolt ons probably, maybe a CAI, catback, headers... something along those lines for better flow
Most cases youll need a few basic bolt ons probably, maybe a CAI, catback, headers... something along those lines for better flow
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since JMM bet me to Jabbi's sticky i'll see your link and raise you with this one!
https://ls1tech.com/forums/new-ls1-owners-newbie-tech/408065-simple-mod-guide-beginners-o-what-do-first.html
https://ls1tech.com/forums/new-ls1-owners-newbie-tech/408065-simple-mod-guide-beginners-o-what-do-first.html