My R32 GTR (i just sold it last week)
was revving to 8500rpm. Tomei rods, pistons, cams. stock crank. was fine when i had it.
but with anything.
Big Revs & Big Boost = Big Bangs
hahaha
nah seriously, sustained thrashing, repeated high revs with high boost is bound to cause more wear and tear on a motor and shorten its life.
theres prople running 9000, 10000, 11000 rpms on RB26s...
depends on the exact hardware....
just how often to you want to rebuild it