nah no standard piping will be used
Don't know any one using it
Yeah it's a good idea to replace all the standard piping
The standard black plastic piping ontop of the radiator is restrictive on one end because it's only 2inch in siZe
That's only the case on S13/180's (hence the reason we include the cross over pipe for them cars). The S14/S15 is 2.5".