DIY: Acura NSX Front Lip Replacement Installation Instructions

If you have a 1991 through 2001 Acura NSX and would like to replace the front lip (aka front under spoiler) with another OEM part or aftermarket lip, here’s how you do it:

Job: Install New Front Lip on Acura NSX

Difficulty: Easy

Time: Less than 1 hour

Tools required: Ratchet with 10 mm socket with extension or a deep socket

Number of people recommended: 1

The front lip is held on by 13 bolts. You will need to use a ratchet with either a 10 mm deep socket or a regular 10 mm socket with short extension adapter because the bolts are a bit deep from the access holes. For cars with a stock ride height, you should be able to do this without raising the car up. For lowered cars, you may need to jack up 1 side just so you can see what you’re doing underneath. If you have access to a lift, that would be ideal and will cut your install time down significantly.

Acura NSX Front Bumper Lip Spoiler Diagram

The image above shows the location of the 13 bolts. Simply unscrew each starting from one side and going to the other. The lip spoiler will come right off.  You then probably want to clean off the debris on your bumper that accumulated behind the lip over the years.

If mounting a replacement OEM or similar lip, it will  have 13 holes and the process to install is the reverse of how you took off the original lip.  You will use the same bolts, too.

However, if you’re like me and went aftermarket, the replacement isn’t quite the same. I went with a Seibon Carbon front lip. First their CF lip only has 8 holes, not 13. This is fine because the material is much stronger than the OEM lip. However, the holes were also a bit smaller than the ones in the OEM lip. This matters because the OEM bolts have a step in them after the threads that make them wider. Therefore, you will either need to get new bolts (like I did) or use a drill bit to make the holes in the Seibon lip a little bigger.  Also, most of the holes lined up just fine, but I had trouble with 2 of them. So I was only able to install 6 of the 8. When I get time to put it on a lift, I’ll put in the other 2. Visibility below was difficult, even though I had the car jacked up.

Acura NSX OEM Front Lip

The image above shows the OEM front lip.

Acura NSX OEM Front Lip Removal

The image above is of the OEM front lip after it was removed.

Seibon Carbon Acura NSX Front Lip

The image above shows a side by side comparison of the OEM lip vs. the Seibon Carbon fiber replacement under spoiler.

Seibon Carbon Acura NSX front lip comparison

The image shows another comparison.

Seibon Carbon Acura NSX front lip oem comparison

The image above shows the difference in height. The aftermarket carbon fiber lip is significantly taller.


The image above shows the OEM bolt on the left and the replacement bolt type I purchased on the right.


I got the bolts from Home Depot. Everbilt M6 16mm. They come in packs of 2 so you’ll need 4 packs.

Seibon Carbon fiber front lip for acura nsx

Above is the finished product. It makes the front end very low, but I like the aggressive look. Just have to be very careful driving around town.

I rank the Seibon NSX-R spoiler as follows (1 to 10 with 1 being the worst and 10 being the best):

Build Quality: 10

Fitment: 8

Finish: 10

Price/Value: 10

Comments: The Seibon Carbon front lip spoiler for the 1991-2001 Acura NSX is great. It is priced right and quality is above what I imagined it would be. I wish it came with instructions, but this is why I made this post. Fitment was not perfect, but it wasn’t that big of a deal. The finish is very good with a great carbon fiber weave. The front lip comes with a layer of clear coat applied, giving it a glossy finish. I plan to add an additional layer of clear coat and then put some clear bra film over it.