my $25 one piece underpanel
 

So I wasn't going to spend $100+ for a pre cut sheet of plastic and some nuts and bolts for a 15 year old car that's going to see some track time, so I ordered myself a sheet of ABS and made my own for ~$25. The sheet of ABS was $22, and the hardware was about $5 from advance auto.

No real DIY, the pictures should explain themselves. Thanks for looking

the ABS sheet uncut
http://i183.photobucket.com/albums/x...o/IMG_4421.jpg

http://i183.photobucket.com/albums/x...o/IMG_4422.jpg

step one, traced the shape of the mouth on the backside of the cover
http://i183.photobucket.com/albums/x...o/IMG_4423.jpg

laid down the lamb chops to shape the backside of the panel

http://i183.photobucket.com/albums/x...o/IMG_4424.jpg

making the cut

http://i183.photobucket.com/albums/x...o/IMG_4433.jpg

final step is drilling and mounting with bolts, nuts and washers, or zip ties work too.

http://i183.photobucket.com/albums/x...o/IMG_4433.jpg

http://i183.photobucket.com/albums/x...o/IMG_4427.jpg

http://i183.photobucket.com/albums/x...o/IMG_4435.jpg

http://i183.photobucket.com/albums/x...o/IMG_4434.jpg

http://i183.photobucket.com/albums/x...o/IMG_4436.jpg

http://i183.photobucket.com/albums/x...o/IMG_4429.jpg

The design is still early in its stages, I know it's ugly as heck, but it's better than no panel. I plan on polishing up the tracing soon and give it another go since I have another M bumper to mess with while this one is on the car.

I'm very confident in the quality of the material and the mounting, it's not going anywhere. Some of the edges are still kinda rough, but I'll sand them down some before putting the bumper back on.

Once again thanks for looking. If anyone wants anymore details feel free to PM me

Awesome! I'll be doing this for sure.

I'll send you the cardboard mock up like I promised. You can edit from there so it's perfectly symetrical :cool:

Nice going to do this fo sure

Nice! Where did you source the plastic from?

Very nice! This could be a movement. I think you should send me a copy of the template too :wink:

i was planning on doing the same

awesome job, my underpanel is currently intact *sorta* but if I ever bust it I'll probably go a similar route

Great job!

Here's the under side of my '99 ti with the M Techic bumper and splash guard.

nice! how'd you make that

I didn't make it. It's the oem splash guard for the M Technic bumper. There's a piece that fits inside it that fits against the radiator bottom as well.

bavauto.com sells them bmw part # 51 71 2 250 643

that looks great

Looks like a factory piece, very nice!