i just instaled Boch +4 plugs in my 95 a6.. they had a performance increase garrentee so i went for it... Wat a difference around 3000rpm and up
If you dont have them in ur car u better soon

you stall them as is or you have to re-gap them and could you provide the bosch parts number Thansk

as is ..i will get u the part number tommorow its at my shop..

You should've gone with the NGK Oem plugs. The difference you're seeing is not due to the +4's ,but due to the plugs being new.

I tried Bosh+4, but after 6 month, I got CEL light. I preffeer NKG.