There are many different ways you can tell an LS from a GSR from a Type R. Depending on how you are viewing the cars it can vary. If you are Looking from the outside, obvious choice would be to look at the badging, in cases that the badges are takin off of the vehicle like mines is, you can also look at the wheels. Each model has their own specific wheels provided they were never swapped out. The LS has a mesh style wheel (lot of spokes) while the GSR's come with the Ninja star design (5-Spoke) and the Type R's have a 5 Lug design on them.In this day and age it is very hard to tell the difference since many people swap parts or try to make their car look like a Type R so if you get the Chance to look under the hoods of each one, it is VERY easy to tell. The Integras have a Series code under the hood to the left of the headers. The LS Engine codes are B18B which is non-VTEC......The GSR's are B18C1 with VTEC...and the Type R's are B18C5 with an even stronger VTEC....again very confuzing if their has been any engine swaps in the car. You can also tell with the Gauge cluster. LS Redlines at 7k Rpm, GSR's at 8k RPM, and the Type R Cluster has a 10k Rev Limit on the cluster. Given all of this information, If someone takes enough time and modifies their car, it is nearly impossible for you to tell since all 3 models, their parts (exterior AND interior) can be interchanged, therefor an LS can look exactly like a type R or GSR. Match the Vin number on the windshield to the Vin number on the Engine. If they match, Whatever code that Engine gives you, Is That Vehicle (ex. B18B, B18C1, and B18C5). The information ive given you so far are all based on the fact the vehicle is in its stock or original form. Hope this helps you out. Why do you ask anyhow?