This.

Search around please, there's a TON of threads on this information. At least one with all the information that you need and it's stickied.

Also note, when looking for performance mods, Grand Prixs have the same engines and basically all engine mods will transfer over, whether it's an L36 or L67.

Not a whole lot, there are small things, like fiberglass hoods or lighter rims. But with these cars not a whole lot. Also, the interior won't make a HUGE difference, the seats aren't super heavy to where it should matter in a street car, I could understand if it's a drag queen, but not necessary or really beneficial in a street car.

 

front & rear bumper supports, spare tire, jack, on*, XM, evap, EGR, unnecessary brackets and shields in the engine bay, lighter wheels and tires (makes a big difference), changing to an l36 flywheel and torque converter (also makes a big difference) lighter body panels (hood, fenders etc.), lexan windows, airbags, windshield washer reservoir pump and lines, even air conditioning if you like 100 a/c like me

you might also consider doing a 3.29 chain and gear set swap, only do this if you spend most of your time below 70 mph

 

Most of those things are there for a reason on a car, especially if it's going to be a daily driver. I can understand replacing some supports and stuff with lighter material if it was strictly a drag vehicle, but I think it may be doing too much for a street or daily driven vehicle.

The wheels moreso than the tires will make a big difference on these cars though without sacrificing reliability. If you want performance tires you really can't be picky with the weights.

So on a daily driven vehicle out of the things you listed I think it would be smart to look into removing the spare tire (put it back in if you're going on long trips out of town), different tires and rims and maybe the EGR, although you will probably lose some MPG if you remove the EGR.

I really hope you kept your airbags, those things are life savers, i'll never drive a vehicle without them lol

 

headers, u bend delete, cold air inductions CAI instead of K&N cus K&N suck, cat back, and a tune. should give you ood numbers after that. That is the first mods posted on another 100 forums.

 

i have done every one of the ones i listed with the exception of lexan windows, which i am doing this summer, been looking at some fiberglass fenders and lighter buckets/5 point harnesses too. and as for airbags, i could care less 90% of the cars i like don't have them anyway.

 

lexans a bad choice. it breaks into shards. It doesnt break like regular car glass. Well even regular saftey glass can break into shards buts its safer then lexan. Superlite billet 3 piece rims are like 10 lbs light per wheel then most other wheels and they look good prob is they are like $500 a wheel and need to be shipped from brittan.

 

So you end up with a car that gets worse gas mileage (from the EGR delete), won't pass emissions, does worse in a crash (especially if you're talking about removing the metal bumper supports, not just the foam), and that you need to call for help every time you have a flat?

On a DD IMO that's a bad idea- especially screwing with crash safety parts. If you get in a wreck, and the car ends up with more serious than normal damage- and the insurance rep sees that you stripped some of that stuff out- I'd bet it would be questionable if they would cover it. I'd also imagine they're giving you a discount on airbags too- and if they're removed, then you've breached the contract.

Honestly, especially having a nearly stock L67- there is much more performance to be had at stock weight for cheap without gutting the car.

If you're going to go crazy with weight mods- there are much lighter platforms to start with- pick up a Honda hatch or something and gut the heck out of it.

 

You do realize that the airbags are there to keep you safe right?

It'd be different again if it was a drag car that was caged, with a racing seat and you were always wearing a helmet, but that's not the case.

Demo Car Crash With and Without Airbags - YouTube

 

The k&n filter isn't enclosed enough to seal it from the engine compartment also its not insulated so you could mod the one you have or get a different one. Like a cold air inductions one. And unless your building a pure strip car I wouldn't reduce the weight by removing anything. especially safety equipment.