A common misconception is that aftermarket parts add value to a vehicle. People think that because they are spending money on something then putting it on the car, the car should be worth more. They just don't realize OEM is almost always better quality than aftermarket, not to mention OEM stuff was designed by the people who built the rest of the car, so it's going to fit and function better. One more thing is when people see performance mods the first thing that comes to mind is that the car was beat to hell.

Correct. If I'm buying a used car, I want a stock one. Of course, if I look it over and see that you modded it and put it back to stock. I'm even more suspicious.

That being said, if I ever sell my Z it's getting sold as-is. I made that decision when the turbo kit went on. I'm selling off all of the OEM parts to clear out the garage and shed.

I always keep the stock parts. When it comes time to sell the car, IMO, aftermarket parts reduce the value of the car when you are trying to sell private party, and add nothing to the car on a trade. When I was initially shopping for my Z I was looking at used, but if it had any aftermarket parts I didn't even consider it.

When I sold my Eclipse to buy my Z, after 10 years of ownership I still had the factory cat-back and intake. The couple that bought it were car shopping for their 16 year old daughter. I seriously doubt they would have given the car a second look with a loud exhaust and cold air intake still on the car. Then I picked up some pocket change selling the parts online.

Keep the OEM.

You never know if you need to go in for warranty work.

And selling, you want to be as OEM as possible (had to sell my SRT w/the S2 upgrade package, because otherwise it'd throw a code and not pass emissions :icon17:).