i used to run similar whp to you mate, i ran horrible 60 ft times at 1/4 with no diff, i went for a trd diff, using redline 75w90 oil and its the best mod ive ever done!!!
If its going to be used daily I would say quaiffe, but for using at the track/drags use a TRD or cusco. I know the cusco does clunk but is awesome on track.
Do you run a stock LSD at the moment or dont have one at all? We sell KAAZ Differentials 1.5way with quite a few members running them on here with no complaints, really good high quality differentials and KAAZ give you the security of knowing they have been in the business for a very long time!
For a front wheel drive car the best option is a KAAZ 1.5 Way LSD.
Just like the KAAZ 2 Way LSD upon acceleration the pin moves the plates out and locks the diff and in turn limits the wheel spin or slip. But upon deceleration the pin moves to a new position but only applies ½ the force as if it applied the full force the car would be unstable under braking and deceleration.
When acceleration around a corner you will "feel" the diff working for you and through the steering wheel you will feel the diff pulling you around the corner. This can be a strange feeling, but you will find that you also now have much higher exiting speeds.
As well as 1.5 and 2 way KAAZ LSD, KAAZ also offer the KAAZ Solid Type. The KAAZ Solid Type uses RS plates and offer a much better reaction time when a LSD "Locks" up. Take some time to read about the KAAZ Solid Type LSD.
what diff was it mate a helical one or mechanical?