Dear RC,

Thanks for your highly valued opinion.
Fuel quality here is not the best, thats right. I usually fill my cars with 95 octane. My 997 pings even with that at very low revs. My Cayenne S shown no problem due to its lower compression ratio. Sometimes we find only 90 octane which makes everything even worse.

Was considering a chip and filter by techart. they claim 510 hp and 720 nm.

Will it affect the reliability of the engine ? I thought it only adds some boost and therefore should be safe.

Any further advice is highly appreciated