4-1 is fine, I use 4-2-1 only because of the clearance on my car.

 

4-1 clearance is good on many headers now due to new designs...
try www.dcsports.com and this site shows installation of dc 4-1 header so you can see clearance for yourself www.superstreetonline.com/howto/32378/

Just search web for 4-1 header/exhaust manifold and do some research, loads of differant designs/manufacturers
good look