Ultimate 400 EX Pipe Comparison...

[Maryland 400EX]

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!

[Maryland 400EX]

Damn... This didn't come out the way I set it up and it looks a mess but ****, I should have been working anyway... The numbers are there for those who care to line them up. I'm just trying to provide more info on pipes since there's not a day that goes by that guys aren't asking "Which pipe?" I'm undecided on a pipe personally because of the minimal gains, noise and price per HP. I'm a part time power junky and I'm determined to transform this undertuned sled into a fire breathing monster shortly...

[YLW400]

Where abouts are you in Md?

[Maryland 400EX]

Upper Marlboro...

[YLW400]

Cool, any good places to ride there?

[Maryland 400EX]

There are lots of places to ride here because back in the 70's this was motorcross heaven. I ride the power lines mostly which lead to other trails. Also, the train tracks nearby allow me access to other atv trails. It's definitley good riding here...

[Razorback]

Originally posted by Maryland 400EX
Damn... This didn't come out the way I set it up and it looks a mess


here you go...by the way, thanks for posting this information :D


..............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

[RytM1]

There was also an exhaust shootout from an issue of Dirt Wheels early part of 2001. Someone posted it in a Yahoo Groups-TRX400EX site. http://groups.yahoo.com/group/TRX400EX/files/Dirt%20Wheels%20exhaust%20shootout/

wow, the white bros had hte most power :) can;t wait to get my header