is there a big difference between resonated and non resonated testpipes

 

in terms of sound, yes.

much less rasp with resonated test pipes.

imo, the extra cost is worth it to get resonated test pipes.

look into the fast intentions stainless steel resonated test pipes.

 

does the FI have the least rasp or does is it all the same

 

As far as we know, the FI resonated pipes have the least is any rasp. Of course rasp you may get is totally dependant on the exhaust system you have and it's ability to handle the extra flow.

The reason they rasp less, is because they have 8" perforated core resonators on them. Again, from what we know, they are the largest resonators on test pipes.

Rick