FWIW, there was a vendor here, 'Ken', who offered a one piece aluminum version of this set-up. I started ECTA Land Speed Racing my '02 LS Sport at that time and installed it between meetings. (See 'Land Speed LS' in the performance section.)
I actually installed both the air tube and a complete Magnaflow cat-back exhaust system within a few days time. The sound improvement was GLORIOUS!!!
However, on the one mile course, there was NO improvement at all. I ultimately got my NX 'spray' system working, complete with a stand-alone methanol fuel system and I wouldn't be surprised if the exhaust improvements and the intake tube addition might be of help with the other things added. (I still hold the 'E' Fuel Competition Coupe/Sedan record---now grandfathered in after the move from North Carolina to Southern Ohio. And no one has bettered my record on the Ohio course.)
Add the intake tube and/or an exhaust 'improvement' for the difference in sound. But save your money if you're looking for power.
KS