Whats the HP of a WR450, as much or less than DRZ400 ?
Not sure of the exact numbers, but corked up probably less 
. With the free mods waaaaay more . Sorry I don't have numbers but I'm sure someone will chime in.
One guy at the dealership told me 45-46 hp once modded. I dont know how accurate that is.
with all mods done plus yoshi exhaust ( slip on ) 49.4hp
RC81
Hopefully your not making a decision between the two based on HP.
The two bikes are like night and day. My first purchase in years was the DRZ400
I sold it two months later . I try to ride in different areas and conditions.
Thats why I picked up the WR450 ,sure its a little more cash but worth every Pennie.
a uncorked WR450 will have much better horise than the DRZ
ultimately, is how ya put the power down to the ground.
IMO- you can't compre those two bikes.
My friend just bought a new 2002 DRZ 400 for approx $4700 - I bought a Wr450 for about $1,500 more. I rode his DRZ and was more impressed than I thought I would be - it moves pretty good - the big difference that I noticed between the two was the stiffer feel of the WR. I still like to WR much more but the DRZ is not a bad choice for a trail rider - for the $$.
Those DRZs are nice bikes for sure.. Plenty of power, but yes the two bikes are very different in the suspension area. I love the linear power delivery of the DRZ, makes a great trail machine...
I have stopped thinking those DRZ were lazy since TT member "Burned" told me that he knows of DRZ giving over 60 HP! I think they produce just as much torque as a WR in fact. I don't like the DRZ (compared to the WR) because of the suspension and weight. Plus, I like the quick revs and the "hit" of the WR. But, I've tried a DRZ and I also think it is a really good trail bike.
Got this off another forum - powersportsnetwork.com
Q:
Can anyone tell me the stock horsepower and torque ratings are for the 2004 WR450 Anonymous - 07/23/2004 Answer this
A: i read in a popular australian dirt bike magazine it has a max horse power of something like 51.5hp at 9000rpms and torque of mid 40s
ben - 08/09/2004
A: I don't know about the torque. The bill of sale i have said 59 hp
Anonymous - 09/11/2004
Having ridden both, the WR has the feel of a more beastly bike. However, I do not think that means it is faster. Other than the soft suspension of a stock DRZ, they are both good bikes and very capable on the trails. Oh yeah, the WRs are a lot louder, but again, that does not translate into faster.
the drz is more of a trailbike while the wr is more of a woods racer. Two differeint breeds but both great bikes. The hp is probably similar but the drz is heavier.
I just raced my friend on his Stock 2002 DRZ 400 - I ride a 2005Wr450 (pulled baffle, YZF Throttle Stop) - both bikes are new - not even close, beat him 4 times from stop to 5th gear - we are equally crappy riders - I must say I expected to win but bragging rights are great none the less.
I literally about 20 minutes ago just got back from purchasing an 05 WR450 - I'm looking forward to comparing to my KLX (DRZ)...
both bikes are pathetic stock!!!!!!!
with both of them juiced up, the wr leaves the drz in the dust......... in the open.
My WR is faster than the DRZ... I dunno about a stock 450 though, If you un-plug it, it will be faster.
Isn't it funny how a simple question on horsepower turns into a my bike is faster than yours discussion - I am as guilty as anyone - A final note when riding with my friend who has a DRZ with no electric start - you realize how nice that little button can be - he now has button envy. Cheers
Yeah I didnt want this to be a mine is faster discussion. I only ask because I have never seen hp figures published on the WR but have on the DRZ.
Check this thread out. There is a link in it somewhere to some dyno runs for the WR:
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Have never seen a rating for the WR. The DRZ400E has been rated anywhere from 38 to 42 in different sources I have read.