Yeah i know it's been done over & over again, but, the first one ifitted was a Pipercross to my green 2.5 CD, then put it on the Beastie. Lot's of love & lots of ridicule. All i know is on a V6 Mig they sound great but admit there is little if any power difference. Just bought a K&N kit for the MX5, £62 with cold air feed kit & free P&P. On the box it said guaranteed BHP & acceleration increase. I thought this was a brave promise from a well known company given the legal implications. Does'nt sound as fruity as the Mig did although there is a bark but it's got a huge push @ 3500/4000 rpm in every gear. She flys now, it's realy woken her up. Can't wait to do the exhaust, manifold & do away with the cat.
No wonder Pete's surprised us all @ the Yorkmeet.
Ridicule of Induction Kits is primarily due to the fact that people actually believe what they read on the packet.
Here is a simple fact. Engines require air to run, the colder the air the better. The more air, the more fuel can be pumped in to keep the 'balance' and therefore increase performance.
However, most 'Induction Kits' on sale are a simple cone filter which are coated with an oil. These filters tend to be mounted without protection from the heat produced by the engine. This means the induction is sucking warm/hot air and not the cold air which is preferential. Furthermore, the oil which coat these filters invariably damages the sensitive sensors which detect the quantity of air entering the engine.
Manufacturers spend millions and millions of pounds on R&D. Whilst not having conclusive proof, I'd bet my virgin arsehole on them actually trying the above mentioned filters. They always revert back to the 'panel' filter. There must be a reason for this.
All of the above I have written not directly at you, but at the majority of people who think a cone filter IZ DA MUTTZ INIT!