Not all the owners leave comments on the product.  I have many Viva owners who purchased but they didnt leave any feedback.

I do however know by direct experience on a Viva that experienced bad engine knocking/pinging that caused the engine to loose power very badly.  The owber used RON97 petrol as was advised by the Perodua Service Centre mechanics which solved the problem, but at an extra RM0.90 per litre!

When I found out the owner was using RON97 to get back the lost power, I asked him to try the FireStorm Booster which I know will restore the lost power as well as remove the knocking/pinging issue.

True enough, after refilling RON95 petrol, the problem returned.  I met up with the owner and installed the FireStorm Booster and the knocking/pinging was reduced very much on normal driving but not altogether, especially when the Viva was fully loaded and going up steep inclines.  He was however very happy to be able to use RON95 petrol again and yet had power improvements compared to before the installation of the FireStorm Booster.

I then advised the owner to have the engine de-carbonised as the problem with the knocking/pinging formerly, before using RON97 would have caused carbon deposit build-ups from the pre-combustion detonation.

Sure enough after going to the Perodua Service Centre for a de-carb, the Viva's regained its original performance and even more due to the FireStorm Booster.  The Viva 1.0 was an automatic transmission version which was quite laggy.

So, what are the mods that you have done to your ride?  Is it automatic or manual transmission?

Cheers.