I recently installed a K&N filtercharger CAI unit. I am very pleased with the unit but have a question that perhaps other owners of this unit can answer.

There is a gasket to help seal the edges of the metal box against the hood. However, the intake tube itself goes thru a hole in the metal box that's considerably larger than the tube. It would appear that this would allow hot under the hood air to get to the air filter. Anybody have an explanation of why this is not sealed? It looks like the same gasket used on the edge of the box would work around the edge of the hole as well.

 

Andrew, I've seen the K&N kit and don't know why they didn't do a better job of closing up the opening around the intake pipe. I'd suggest going ahead and adding some material that will keep out the hot air. 850 was the owner who had installed the K&N kit. You'll be glad to know that his dyno results were favorable. I think he gained a bit of HP everywhere on the dyno curve with a max. gain of about 6 hp at the wheels.

 

S2k Dude, thanks for the info. I think I'll do just that.

 

i have the kit on my S. buy some aluminum coated buble wrap and put it all over the outside of the box to help insulate the box and block the opening. good luck

 

FYI, I decided to email K&N directly and ask why the hole was not sealed. They emailed back some b/s that it box was just to protect the filter and deflect "some" air but not to seal against the hood. Also they said that the hole in the box was bigger than the inlet tube so the tube could move with engine torque. I pointed out that:

1. The box is bolted to the chassis and the tube is clamped to the box so how can it "move" with engine torque?

2. If the box is not meant to seal against the hood then why supply a sealing gasket for the edges of the box?

He was unable to supply an answer that made any sense.