firewall modification, depends...
I did this modication last year - went with a purple tag/678 rack with which i'm completely happy. You can install the rack with all spacers under the rack and not have to modify the firewall but this will yield significant bump steer which can be dangerous. I'm fairly certain that this is accurate for all e46 (and e36) racks, ZHP or not. You could resolve this with a tie rod modification kit but that is expensive and you might need to increase wheel size.
The tried and true method is to install bushings above the rack and carefully modify the firewall.
Check out this thread by Benz-tech on bump steer.
I did this modication last year - went with a purple tag/678 rack with which i'm completely happy. You can install the rack with all spacers under the rack and not have to modify the firewall but this will yield significant bump steer which can be dangerous. I'm fairly certain that this is accurate for all e46 (and e36) racks, ZHP or not. You could resolve this with a tie rod modification kit but that is expensive and you might need to increase wheel size.
The tried and true method is to install bushings above the rack and carefully modify the firewall.
Check out this thread by Benz-tech on bump steer.
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