335i, GTO or MS6 Aftermarket performance parts.

[sandertheshark]

These are the three cars I'm considering to buy at the beginning of next year:  BMW 335i Coupe, Pontiac GTO 6-speed, MazdaSpeed6.

Part of my decision process will depend on potential performance upgrades.

I know there's people here who know these cars and the performance aftermarket better than I do.  Can anyone suggest some modifications I could make for any or all of these cars that are a) street-legal, b) will not void the warranty, and c) not be too expensive.

New shocks and tires I've already got figured out.

Thanks!

[JYODER240]

If you're going to mod i'd go with the GTO.

[Raghavan]

The GTO will have the most amount of  mods available from Lingenfelter and other companies like that.
BMW has Dinan to get mods from. Mazda... I have no clue, but i'd take it over a 335i which imo looks fugly.

[SVT_Power]

Doesn't any kind of powertrain modifications basically void the warranty?

[ifcar]

If you're going to wait until the end of the year, you'll have trouble finding a GTO.

[sandertheshark]

If you're going to wait until the end of the year, you'll have trouble finding a GTO.

You think?  I know they're going out of production but I don't imagine they'll dissapear off the lots right away.

[Raza]

You think?  I know they're going out of production but I don't imagine they'll dissapear off the lots right away.

There will probably be a few about, but finding the color/transmission option you want might get tough.  A good dealer will find one for you.

[Danish]

I read this in someone's sig (I think it was Pancor) but "the best mod is the crazy mofo behind the wheel"