Not that you will notice on standard road driving, you would only see the gains on a dyno. The K&N panel filter in standard air box will give the same gains and most likely be cheaper?
I have both on different Corsa C's. The Pipercross Viper because I had it left over from a 2.0L 16v Corsa B, it is a very good cone filter, one of the bet on the market.
What's the best performance car air filter? We find out...
This is an old article, but still the only one I know of on t'net that tries a bit of science. Cone filters generally restrict airflow less (mesh<foam<cotton) than panels in an airbox. Heat soak can negate that, so an induction kit is worthwhile unless you're primarily driving at a constant high speed. The flip side is that low restriction = higher volume of fine particles getting through; there's only so much clever that can overcome physics. Probably not a big deal here, but there's a lot of fine sand blown around in Malaga so it puts me off. Also, the bang for buck is pretty dubious on a 1.7DTi and the same could be said for a std 1.4
An interesting point of the article is that K&N may be the best known name, but not the best performing for either cones or panels (in fact, about the worst) and Pipercross seems to be superior.
Pipercross panel filters do sometime perform better but don't last. I have had them break up and get sucked in to the engine. In one case a lump of the filter got stuck in the throttle butterfly holding engine at 4000 rpm while driving approaching a series of roundabouts. Not fun in a 227bhp 2.0L 16v N/A Corsa B 🙄 😂
I would go cotton type over foam now and keep it clean.
Total Vauxhall did a similar review and the K&N came out on top. Mighty Car Mods also did a filter test not sure on the out come on that one? Closed cone type had it by an edge over a panel filter while open cone lost power once engine was hot.