Hello guys! Could anybody plz comment on the max speed attainable in these models? I have a unique, scratchless and excellently maintained 98 civic Exi, which in 10 years has been driven only 82000 on Petrol and total 6000 kms on CNG. Conversion was carried on lately in Sept. 2007. I Changed plugs, oil, and airfilter lately and tested it on the Motorway, but could only reach 160 on cng. On petrol even it wouldnt cross 165. It is well tuned and has an excellent acceleration, but why cant I go above? Plz some comments.