As an owner of the DF seats, here are my 2 cents.
The best thing to do is to buy a decent track seat and swap it in when you go to the track. You will not find a seat that works for both street and track. The DF seat comes close, but still isn't great. I ended up switching back to the stock seats.
The stock seats meet most of the criteria posted by T2G, apart from the head restraints. And you will be hard pressed to find better seats that aren't super expensive. Also, trying to save a few pounds out of the seat and rail is rather pointless. Now, the SOS rail that I use with the DF seats are reasonably light, but there are areas where maybe another pound could be shaved if it were designed specifically for the DF seats. However, the seats and especially the seat rails are the last place you should look to save weight. They are in the center of the vehicle and mounted low down (on the floor), so any performance benefits from the lost weight are negligible at best. You are far better off losing the weight yourself, since your body is in a higher position than the seats, let alone the rails. In fact, only those with less than 10% body fat should even consider looking for lighter seats. And once you've lost those excess pounds, you should then be able to sit in the DF seats, which are pretty narrow. Unfortunately, you will then have to deal with the seatbelt receiver digging into your hips, unless you are really skinny. The NSX-R seatbelt receiver may help in that situation, and I might try to order a pair to see if they make the seats more tolerable. However, ingress and egress is still more difficult than the stock seats, and the NSX is bad enough as it is in getting in and out of the vehicle.
The best thing to do is to buy a decent track seat and swap it in when you go to the track. You will not find a seat that works for both street and track. The DF seat comes close, but still isn't great. I ended up switching back to the stock seats.
The stock seats meet most of the criteria posted by T2G, apart from the head restraints. And you will be hard pressed to find better seats that aren't super expensive. Also, trying to save a few pounds out of the seat and rail is rather pointless. Now, the SOS rail that I use with the DF seats are reasonably light, but there are areas where maybe another pound could be shaved if it were designed specifically for the DF seats. However, the seats and especially the seat rails are the last place you should look to save weight. They are in the center of the vehicle and mounted low down (on the floor), so any performance benefits from the lost weight are negligible at best. You are far better off losing the weight yourself, since your body is in a higher position than the seats, let alone the rails. In fact, only those with less than 10% body fat should even consider looking for lighter seats. And once you've lost those excess pounds, you should then be able to sit in the DF seats, which are pretty narrow. Unfortunately, you will then have to deal with the seatbelt receiver digging into your hips, unless you are really skinny. The NSX-R seatbelt receiver may help in that situation, and I might try to order a pair to see if they make the seats more tolerable. However, ingress and egress is still more difficult than the stock seats, and the NSX is bad enough as it is in getting in and out of the vehicle.
