Perfect fit with supplied gasket.

33-2156 was a bit too small.

Also washed the car tonight & sprayed water into the hood area above the intake. With the shroud off, there was no sign of water entry.

 

Why did you do those things?

 

Million mile warranty

Reusable

Higher air flow

Piece of mind

Stock filters look like crap after 3800 miles.

 

it seems to me that if there was a better filter, the GM engineers would have selected it. i doubt that they selected a restrictive one unless there was a concern about filtration. if the stock filter looks "bad" after 3800 miles, and the aftermarket one doesn't look bad, where did the bad dirt go with the aftermarket? i'd guess it went into the engine.

if the aftermarket one gives you a noticable increase in hp, and one is willing to risk passing dirt, ok. but, i think the GM guy selected the best for general use. they had to consider the best overall tradeoffs, 100,000 mile engine life vs. least restriction.

just my thoughts.

doug

 

Didn't someone else take shroud off and ended up with water in their intake?

 

yep, that was me. now i don't have any idea how water got in there. if water dosen't get in there with the shroud off then it shouldn't cause any repairs to be non warantee.

so how the funk did it happen. just a bad dream ?

-zig

 

I know on C5 GM had issued a tech bulletin warning of MAF fouling w/ over-oiled aftermarket filters which could void warranty items involving that area. FWIW...

 

Let me cover some things here, like if it was better GM would have done it. WRONG, that would mean there is nothing that could be improved on. Since when have we ever known GM to do that. They reason there is a tech bul. on the gauge filters is because most people can't follow the directions on oiling them. They are to be lightly oiled not oil until you get the shade of red you like. If the directions are followed you will not have a problem. Our C6 has had K&N filter since Sept. long before most anyone even had C6's. We have had no problems and gained 3 rwhp. That is not much power but what I am trying to show is we did not lose power which means we improved over what GM did. Now we sell the 33-2156. It is the closest thing to the stock filter, the 33-2136 is a little to wide and it can distort when you clamp it down. Now both of these filters have the pleats going the wrong direction. I do not know if it would make more power with them going the other direction, probably not but who knows. The filter that is the closest and the one K&N will probably modify the mold is the 33-2771. It has the pleats going the correct directions and the filter only needs about .020 of each side to fit. The problem is that with the way it is now, when you clamp it down it is so distorted that is leaves a small gap on the bottom edge.

 

Exactly! If GM put every top of the line product on the car people would be complaining about the high costs. There would be no need for aftermarket parts in that case. Filters are a trade off, you either use paper and get more filtration or use cotton or foam and get more airflow and less filtration although some of these foam and cotton filters do filter pretty good. It is obvious that with the addition of these filters, improvement comes from more air. Headers and exhausts are another area that show improvement from aftermarket dealers and these not only provide a better sound but also most of the time HP increases.