I replaced the turbo on my 04 VR with another K24. The new K24 has a smaller compressor wheel than my original. I know this because I had an ARD billet compressor wheel and for fun I tried to place the aluminum housing over the old turbo once it was pulled and it would not fit. Now with the new turbo in my car dumps boost prematurely. The car has an IPD tune, ARD TCV, and Forge CBV with the heavier spring. The wastegate was set at 4psi. Any ideas on what causes the boost loss?