My block is rotting, so it wouldn't be a usable engine, but you're welcome to it (sans heads) for a reasonable price if you'd like to come to Rochester to get it.
Or with the heads for a slightly less reasonable price, lol.
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My block is rotting, so it wouldn't be a usable engine, but you're welcome to it (sans heads) for a reasonable price if you'd like to come to Rochester to get it.
Or with the heads for a slightly less reasonable price, lol.
When I had a stock engine I cut around the base of my air box (the part the filter sits in) so that there was no longer anything below the filter, no more hose, no housing, etc. and I didn't notice any difference in performance. I did have to clean the K&N filter more often though. Run it with no filter box at all and there's not a difference. The NA engine can only consume so much air, if you're looking for performance you need to start doing more expensive, involved work to the PRVs.
I logged MAP at the throttle edge vacuum fitting on my turbo car. At full load / WOT the I saw up to a .8bar pressure drop. So while it's possible there is some restriction in the intake it might take a draw-thru turbo to find it. Naturally aspirated I doubt you'd really find much gain on a dyno outside of the realm of measurement error.
That aftermarket airbox deletes the PCV tube which will expose more of the air filter element to the engine, but at the expense of increased crankcase pressure at higher load. In trying to find free HP the meter flap probably is the greater enemy.
I'll throw in my .02 since I have port and polished heads.
I have a thread in the Mod section about my engine build, but long story short, with high compression pistons, port and polished heads, a 1mm shave on the heads and aggressive camshafts, my car dyno'd 147whp.
Now, if the statement is that a Stage II is 140whp (I don't know since I haven't seen an actual stage II dyno'd), that leaves 7 extra horsepower. But, is that from the port and polish or the high compression pistons and compression raise from shaving the heads?
I will say this, looking at my dyno graph I have a big drop in power between 3500 and 4500 RPM. The graph shows that the car leans out in that range, raising to a perfect full fuel enrichment ratio after 4500rpm. So, the engine has more air than fuel available to pump (I have raised the fuel pressure as well and the full enrichment switch is working). Because of the lean condition I had to reduce my engine timing to 15 degrees, thus losing more power.
Because of this I plan to look into modifying the fuel system some, but that is a different topic.
Back on topic, I know Josh at DPI has told me that they stopped port and polish when they did offer that service, saying he found it was actually worse. I have no proof to back this up. I can say that one the two cars I drove that are setup the same except for the pistons and port and polish, they have a smoother power band whereas when my fuel enrichment catches up it has a VERY noticeable kick up in torque/power (http://dmctalk.org/showthread.php?50...-Upgrade/page5 - Post #42).