Do K&N Stubstacks really work?

[Rivernut]

There seems to be only 1 test ever done by Hotrod magazine. Can't trust a magazine that has them as an advertiser. Anyone try one on a jet boat?

[waterslinger]

Used one on a car one time and got 200 rpm on top
end. That was with a 14 x 5 air filter. Do not think you will get good results with a sparkarester. What air filter do you plan to run?
You might want to give the Proform 750 main body
a look.

[Jungle Boy]

Rivernut:
There seems to be only 1 test ever done by Hotrod magazine. Can't trust a magazine that has them as an advertiser. Anyone try one on a jet boat?I have one installed on my 434ci. It was the last pull on the dyno when we tried it. It made 7 HP and 12 ft/lbs torque. The engine builder was amazed and said that he's never seen that big of increase with one. Cheap HP.

[SeaSlut]

I got good results with a 2" phenolic spacer.
I was impressed.
No dyno, but I would say it was good for 5-10%.
[ August 15, 2002, 03:43 PM: Message edited by: SeaSlut ]