| Mr C next time you are in the Midlands please call into the shop and I will show you the flow readings from my flow bench, with std filter, with JHP filter and without filter. without doubt a fresh engine without filter flows marginaly better than a fresh engine with JHP ( or std ) filter but the fresh engine without filter is very soon a worn engine with poorly seating valves and considerably down on power to a filtered engine. Of course if money and frequent rebuilds are no problem go without filters ! jhp john | 
JHP John
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