Why do you have to reduce it to 3"? It would be best if you could maintain the 4" all the way into the compressor. Junior kind of lectured both Layvon and I about not reducing intakes/ inlets to the compressors as you force the compressor to work harder.
I'm psyched that you are going to test the GTX3576 for the low mount! That should be a great turbo for the low mount. Fast spool and probably close to 500 WHP on pump gas!