many 6spd owners with track experience recommend avoiding drag radials at the track. instead, they recommend DR's for the street and ET streets/drags (slick vs non-slick, both bias ply) for the track (bias ply = more forgiving sidewal and less drive line shock/broken parts). but also remember, no mixing bias ply rears with radial fronts.
regarding the 'weak' w58, you may want to avoid the full slick ET drags; others with more experience can chime in on that.
craig
I cannot overstate how correct this is. The W58 can survive decent HP so long as you do three things - Avoid launching it, avoid unsprung/undamped clutches, and avoid big wide sticky tires, especially drag radials.
Personally I would ditch the 19's completely and go to a 17 or 18in setup. 17's have a lot of advantages particularly in the affordable awesome tire department. R888's are fantastic tires but they have stiffer sidewalls geared more towards road racing, and that stiff sidewall means there's that much less flex in the whole driveline between clutch engagement and pavement. Flex in that whole system between your clutch and your contact patch is what will save your W58. For this reason as well, do not for any reason eliminate the rubber 'donut' between the driveshaft and the differential.
Ultimately I would consider a moderately sticky summer tire like a Yokohama S.drive, and I wouldn't go larger than 275 in the rear.
If drag racing is what you really want to do, swap to a V160 or go automatic. The R154 is stronger, yes, but it has it's weak points as well and it will be on borrowed time at ~700-750whp the same way your W58 is on borrowed time at ~450whp. If you are happy keeping it under ~600whp or so, the R154 should work great so long as you avoid combining those evils of harsh launches, unsprung clutches, and huge wide sticky tires.
