gotta customer that has one on his older vw jetta, it actually worked lol. it made the engine detonate lol, made a few psi, nothing fast, but it did work.
caused the ecm to go into limp mode, hahahah, can't tune it, so...
installed some nitrous as well, quick little car, nothing fast tho.
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'94 Chevy Truck: 8.9 et, 408 twins
They might work on very small displacement motors. LOL They are just boat blowers. Not for the engines intake, but to exhaust fumes out of the engine area. Most are only in the are of a couple hundred cfms.
Just for reference purposes.
99' Silverado RCSB Z71: 5.7L Iron LS1, 11.2:1, Custom EPS Cam, Ported 862's,Ported TB, E-Bay Cold Air, E-Bay Long Tubes, Dynomax X-Pipe Exhaust, Electric Fans, Innovative LC-1, Self Built 4L60E, Circle D Pro Single Disc, 4:10 ValueTrac