[23109VC]

I will chime in on this one - based on my own PERSONAL experience with ALL these things...

I used to have a pretty well modified Volvo S60R. the boost was increased and the octane made a HUGE difference in power. driving it on 91 CA gas vs 100 octane wa slike a different car...HUGE HUGE power gains.

I experimented with adding toluene and xylene - got at home depot and some paint shops

I also tried the over the counter stuff

I finally found a gas station near my home that sold VP 100 unleaded race fuel. that is THE way to do it if you MUST increase octane.

the over the counter stuff is crap. the ones with MMT may help...marginally..but nothing like race fuel. period. NOS brand race octane booster was the one I tried and seemed to help a little..but it was more like a band aid..it helped a small ammount, but it wasn't as good as race gas. not even close.

on my S60R...a high boost turbo car - octane was a huge factor. it helped offset detonation and allowed the car to run more advanced timing and more boost. it also offset power loss from hot ambient temps... which really sucked the life out of that car...

i can say that mixing xylene or touenewas a big fat PITA. you spill it on yourself..your hands burn...it's a mess...i hated it. fining a gas station near your home that sells VP 100 unleaded is great...i bought a couple of 5 gallon gas cans, filled them up..and then blended them in with my fillups.i woudl run 3 gallons or so with a tank of 91 and hte blend charts showed that got me to about 93 octane..enough to really feel the difference but not enough to waste money on unnecessary octane increases..

skip the over the counter octane boosters. waste of time/ money.
skip the xylene/toluene - big PITA / mess
find 100octane race fuel..put some in your tank when you're on empty and drive around and see if you notice any gain.

if you are LUCKY, you will noT notice any difference, b/c once you get hooked on race gas...it's addictive. if your car really needs it...you will hate driving w/out it. on my old car, the S60R, it WAS A HUGE difference, and driving w/out it - sucked. sucked sucked. at $6/gallon for the race fuelkk it just added to the expense of running my car..which was jus tmore $$ to spend on the car...

anyway... i'd just suggest you skip it unless you have a majorly modified car and are going to a track where tenths of a second are important to you.

to just drive your boxstera nd have fun - i doubt you need it.

has anyone here tried race gas in a stock boxster and did it do anything you could feel?