I've been driving for a year now, and I still have my first car, a '99 GP GT coupe. My father bought it with a blown engine (connecting rod burst through the block) and overhauled it. He then added a '07 Impala 3.8 motor, and yeah, it runs pretty good. I haven't done anything to it yet, but I was about to start, since I got a job a month ago and I'm finally making some money.

Here is the "problem". While the '07 motor has around 25K miles on it, the chassis, tranny, differential, etc. all have 165K miles on them. Not very good. So far nothings gone wrong (except bad oil pressure switch), so I'm glad about that, but, should I invest money into a car that's standing on its last legs? Even though my dad has his own garage, he won't buy me a new tranny. He would help me pay for it and charge no labor, but I'd be dishing out some dough.

Do any of you guys have GPs with mileage this high, or am I alone? I was just about to place an order on ebay for some stuff that will add
aesthetic appeal to my car, like a GTP badge, new grille and smoked tail-light covers. Also, I was going to debadge some of the "3.8L V6" badges and Pontiac logo badges. The GTP badge I'm getting is for the grille.

So, guys, should I invest money into engine components (roller cams, headers, high flow mufflers and cats, CAI, etc.) even though I'm riding on a high mileage car? Or should I wait a year or so, and trade it out, which is what I'm thinking of doing. Insurance will be cheaper, as I'm 19 now, so I was thinking to get a VR4 or a late 90s WS6. Plus, I've always wanted a stick, lol.

Any advice is greatly appreciated!