DAZDA,

Well in terms of power potential its the safest way to go too big, but in terms of mr-plod-attention potential its also the worst way to go. Personal decision really. I'll be going 3" all the way myself.

Definitely re-inforce the x-member if you're cutting holes in it, think of the torsional forces being applies to it during cornering and accelleration (especially with a SR20).

Regards,

Dave

_________________
USA Daily: 2014 Nissan GT-R, very minor modifications for the track
USA Project: 1978 280Z, minor suspension upgrades, VK56DE conversion in progress. SOLD
AUS Race Car: 1973 240Z, L28ET, Autronic, GT35R. SOLD
AUS Project: 1972 1600, 3200km old S15 SR20DET, ground up rebuild. SOLD

i rang maddat and they sell a rear X member for $250 with a 4inch crush tube in it soyou can run 3inch, they also do an exchange and that cost 150 + postage

blackdat,

yeah most workshops about the place do it. also ring datsport, and if you're in melbourne try cam mckinnon (cm510.com).

regards,

Dave

_________________
USA Daily: 2014 Nissan GT-R, very minor modifications for the track
USA Project: 1978 280Z, minor suspension upgrades, VK56DE conversion in progress. SOLD
AUS Race Car: 1973 240Z, L28ET, Autronic, GT35R. SOLD
AUS Project: 1972 1600, 3200km old S15 SR20DET, ground up rebuild. SOLD

Dude while your getting the hole enlarged you should think about getting the rear cross member made adjustable.

http://www.datsport.com/Adjustable_rear ... ember.html