There is not many thread on this. Some say its loosing a bunch compared to stock and other say its alright. Ive been looking at it latelt and most of the time youll lose a lot or TQ and HP from 0-4500-5500 and then it will pick up, if the intake is any good.
Holley hi-rise is a real performer, like the FAST(mid runner) but mosty over 5500-7500. It picked up 50hp over the FAST lsxr 102mm(long runner) in stock ci ls3; with LSA heads(maybe ported) and a 231 244 comp cam iirc. Engine dyno, article by lsx mag or something like that.
Hi rise do not fit at all under hood.
BTR is working on a new intake that looks nice but cathedral port as of now. Dont know if any square port are in the plan.
TSP has one comin too similar to sniper, for ls3.
There is another nice one, 1500$ fab one, but its expensive with no real word results but they claim 30hp over stock intake...
Ls6 vs fab...
https://m.youtube.com/watch?v=IncpuWORLSI
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13' 1LE
Old setup: TSP 231-236/Tick 660/.105 PR, UDP, SW LT 2'' & HFC, stock NPP & H pipe, VR-DRX CAI, air scoop, Goertz1 manifold, 102mm BBK, 26" Toyo DRs, Forgestars R17x10 & F18x8, rear seat delete, remote Pat G tune Autocal, 7400 limiter, Spec Mini Twin. 91oct. 11.90@122.3, 0-60ft 2.0 / 11.99@123.6, 0-60ft 2.1 DA+819 ...519RWHP SAE
Solid roller SBE LS3, FED, LLSR, 91oct, 605rwhp N/A. Tuned by Pat G. Build by me.