Yeah, I think mine does better than your average v6 owners like (hondas, dodges, audis without turbos)... With That being said. I'm happy with the way my v6 performs stock. Buy would love some upgrades, like a cam (e303) if possible in a v6, headers, cold air intake, so on and so forth.
Question 1 about COPs
Coil Over Plugs
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If your COPs fail youll notice that basically it is misfiring. Youll have the Check engine light on that flashes indicating this. Take it to Pep boys on 23rd and they will do a free Diag test on it and it will tell you wich COP it is. Go on ebay search in Lincoln LS Coil Pack. I bought mine for 17$ Each and work like a champ still to this day..
Number 2
There are not alot of mods you can do with the V6. Obviously you can do cosmetic mods such as LSE Bumpers Side skirts what have you just like any other model of the LS. BUT When it comes to true preformance I DONT Beleive that SCT which i ALSO Believe is the only company that makes a real programmer for the LS. SCT last time I check only makes a programmer for the LS8. Which specs wise doesnt jump it up a whole lot But it is enough to notice a complete change. You can also download more tune files to change up stuff.
I know there are some people who have done Turbo kits on the V6 but you have to remember. Most this engine work being done to these LSs arnt just bolt on kits you can buy from a company such as Summit Racing or Ebay or what have you. From my knowledge you cannot just buy a Super charger for the LS and just bolt it on and say here we go tht another 100 to 150 more horses. Nope.. If you check out QuickLS he has a super charger build form. Alot of Custom work done in his LS to make a Super charger fit.
So with both the V6 and V8 , V8 has more capability with Mods and what have you and the V6 is really limited to what you can do.
About the most you can do with your V6 is add a complete Cat Back system to it. get some Magna High Flow Cats, Grab a K&N Airflow kit and cold air it. And to my knowledge thats about all the bolt on ebay sh1t you can get for it. When it comes to the V8. Alot of innovations are still in way on trying to fine tune SCers and what have you.
V8's can add Cat back system, High flow cats resonators all that good stuff. intake kit. SCT Programmer , Custom SC build and some other cool parts such as ignition wise.
A LS isnt like a Honda.. You can just buy a turbo kit for it anywhere.
Or like a mustang where you can just grab a kenne bell SC and slap it on and there ya go..
Alot of CUSTOM work has to go in these engines to get them top notch high horsepower.
IMO if your going to put that much money into it. Just grab you a LS2 or LS7 do a engine swap and tranny swap and there ya go..