Maryland 400EX
06-14-2002, 10:11 AM
While browsing through a magazine stand, I noticed a copy of the June 2001 ATV Sport magazine was on the floor and it happened to have a 20 pipe comparison for the 400 EX. For those who have seen this, sorry for resurrecting old news but for those who haven't this article titled "Up In Smoke" is the most detailed pipe comparison I've ever seen for the 400 EX. First of all, none of the pipes made more than 1.9 peak HP over stock. Secondly, the majority of the power that was gained was at low and mid rpms. I'll try and summarize what pipe made the most HP at certain speeds.
20mph 30mph 40mph 50mph 60mph
Stock 8hp 17hp 25hp 24hp 19hp
Advantage
Performance 7 19 26 27 21
Arrow 7 18 26 25 18
Big Gun 9 18 25 25 20
Curtis
Sparks 11 18 26 27 23
DG Perf. 10 17 25 25 20
Duncan
Racing 10 19 25 27 21
FMF Racing 10 18 26 26 20
HMF 10 17 26 24 19
LRD 10 18 25 26 20
Powroll 11 19 25 27 23
Pro Circuit 10 18 26 25 19
Ritter Cycle 8 17 25 25 18
Supertrapp 7 18 26 25 20
TC Racing 8 19 25 24 19
Trinity Racing 8 19 26 26 21
White Bros. E 11 18 27 27 23
Yoshimura 10 18 26 26 20
Max Power King? Curtis Sparks 27.8 HP... Tests were done with manufacturers recommendations for jetting and airbox mods... Now we have the REAL SCOOP on 400 EX Exhausts!
20mph 30mph 40mph 50mph 60mph
Stock 8hp 17hp 25hp 24hp 19hp
Advantage
Performance 7 19 26 27 21
Arrow 7 18 26 25 18
Big Gun 9 18 25 25 20
Curtis
Sparks 11 18 26 27 23
DG Perf. 10 17 25 25 20
Duncan
Racing 10 19 25 27 21
FMF Racing 10 18 26 26 20
HMF 10 17 26 24 19
LRD 10 18 25 26 20
Powroll 11 19 25 27 23
Pro Circuit 10 18 26 25 19
Ritter Cycle 8 17 25 25 18
Supertrapp 7 18 26 25 20
TC Racing 8 19 25 24 19
Trinity Racing 8 19 26 26 21
White Bros. E 11 18 27 27 23
Yoshimura 10 18 26 26 20
Max Power King? Curtis Sparks 27.8 HP... Tests were done with manufacturers recommendations for jetting and airbox mods... Now we have the REAL SCOOP on 400 EX Exhausts!