soulific

iTrader: (3)

I recently noticed I bent many of these bolts under the car. What are these bolts for? Are they from the inside coming out or serve any purpose? If so I bent over 4 of them really bad.

sinister2c

They are for the underside panels. These are non standard on USDM. I think JDM is standard. I put some 3GS panels on my car. It's almost identical except GS was longer so I trimmed it short to fit. Most of the holes for clips and screws lined up otherwise.

soulific

iTrader: (3)

Makes sense, thanks for the info! Did a search and the covers looks nice and some say it helps with aero dynamics... Would add some myself but the underside looks so dirty there may be no point lol

2013FSport

iTrader: (2)

Found this some time ago....
So GS panels fit eh? Ya, the 2013 350 has those studs...

sinister2c

Yep, just have to cut the back a little shorter. The GS goes back further too, all the way to the rear stabilizer mount.

Jeff Lange

iTrader: (1)

2013FSport

iTrader: (2)

You might want to bend them straight and seal them with something pliable but non-acidic. I.e. careful using silicone as it may induce rust do to its acidic properties when curing.

Just in case you forge a creek or something....

sinister2c

Jeff Lange

iTrader: (1)

Good question. Most likely due to cost reasons, but that still doesn't answer why they added them for 2009.

Jeff

2013FSport

iTrader: (2)

Corporate EPA until they realized they don't help fuel economy as much retuning the powertrain?

redspencer

iTrader: (1)

Here's how the full underbody panel set looks like on the JDM 2IS. Years ago, I tried looking around for this set as part of my 2IS build (as I think the panels would have some aerodynamic benefits on the track) but I was unsuccessful.