So I've recently replaced my old HKS 2530'S with the GARRETT 2860'S-5. I was instantly impressed with the low down power. I'm still trying to convert the speed into RPM to get a direct comparison. Because the shop that did the power run with the garrett's was a V8 place they didnt realise the RPM limit, getting off it at around 7,000rpm in 4th opposed to 8,200rpm so the run was never complete.
Now, they were different dyno's but I've had my car on both previously making nearly the same power. But needless to say these GARRETT turbo's are good bang for buck. On the garrett run we had major issues with wheel spin, seen in the dyno also.
HKS 2530'S made 21PSI at 5300
GARRETT 2860'S made 20PSI at 4,300