SPP 21 Outboard Pipes. RS vs. NR

[Bill Britton]

Looking for info on both of these SPP pipes. What are your opinions, and the difference between them.

 

[RodneyPierce]

RS will build a little more torque, NR will provide a little more RPM. Of course, propping accordingly. Both will get the job done, and provide great power.

I have been able to pull the most prop with the RS, and still net great RPM. But have gained nearly 2 mph with the NR pulling a little less prop then I was able to with the RS.

 

[Dan Hutchinson]

what about the TD pipe ???

i plan on buying one of the 3 but not sure which is the best for the motor im buying.

 

[RodneyPierce]

I prefer the NR or RS over the TD

 

[Mike Larson]

Bill... I've ran the RSOB on a greenie cmb for some time.... Its a little fickle..... HOT, and acheiving it is the search.... intensively with battling the heat sink effect of the lower, piping up, gets interesting.... reducing water intake to the engine, and prop dia reduction has my studies to date..... then... well, i get a 32K engine and a 30mph boat... well maybe a little more..... theres always something to work on, i guess..... its great when it hits.... if itll hit..... ( heat race ineffective, and well... keep testing)...... test well... Mike

 

[Bill Britton]

Leaning toward the NR if my Cooper source doesn't come through. I have a JP Racing/Nova hybrid that feels the need to breathe...