I have a BMC panel filter in my one and cleaned it out the other day.
Surprising how much muck came out of it.
Got to have an air box somewhere on the Pug, if its not been changed or got water into the box. Could be cutting down the air flow.
I always put Miller sports oil in the derv to boost my one a bit.
Dont know if this helps.
http://www.kelsey-forums.co.uk/cgi-b...m=1314444553/0
And what you need to change.
http://www.ebay.co.uk/itm/K-N-AIR-FI...-/151014460032