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Discussion Starter · #1 ·
I was wondering what everyone thought to be the best exhaust for hard hitting, bottom end torque? I previously had a 400ex where I thought the low end was 2nd to none with a HMF sport series slip-on. It's safe to say I'm not so concerned with the peak number as much I am concerned with how the curve is. Ideally it would hit low and gain up until 5,000 rpm or so. I don't like to rev my machine out too much. What I love is being able to pull hard on long steep hills by "loading" up the engine (almost lugging) and coming out of corners really hard. With my positive experience from HMF, I contacted them about the 700xx requesting the following:

"I looked in the forum and only found the 700xx before and after HP. I'm interested in seeing the dyno graph for torque across rpm (showing stock vs. competition series). If nothing else do you have before and after numbers? Although this would be beneficial I'd like to see how hard it hits. Would you recommend the slip-on or full for better torque? I'm just looking for more bottom end. "

HMF's reply was:

"I have no dyno charts for a 700XX with the Competition Series. We did the bulk of our Competition series testing with a YFZ450 and an Outlaw 525. On both machines we gained about 1 HP and 1 lb/ft of torque over the Performance series. The full system on the 700XX really shines from 5500 RPM up to the rev limiter. If you are strictly looking for more bottom You will be very happy with the Competition slip on."

I'm reluctant to purchase knowing they don't have a dyno chart, but I'm sure I wouldn't be disappointed. What are everyone's thoughts? Any recommendations with dyno charts?
 

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Discussion Starter · #3 ·
full or slip-on? I would probably add a cam in a couple years and don't want to have to buy twice? Would the slip-on still be alright for my purposes or not flow enough?
 

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I don't think Tim Barker makes a slip-on. Go ahead and get the full exhaust. You can find them for $479 right now wich is a great deal! If your gonna get a cam then you'll want the bigger header.
 

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If you just want a slipon, just take the baffle out of the stock muffler. Not much difference. Barker exhaust all the way.
 

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Discussion Starter · #7 ·
I did see the dyno charts but it looked like the dyno started taking data after a few thousand rpms. Either way it looked pretty good with how much more torque there was. I was a little turned off with how barkers advertises power during over rev. Can anyone comment on the power for holeshots?
 

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well for holeshots u want good mid and barker has that... and keep in mind if u ever had a tach ud see the u spend a lota time over 5000 rpm
 

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Correct, Idle is like 1600rpm I think if not a touch more. Just a touch of the throttle and your over 2k instantly
 

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Correct, Idle is like 1600rpm I think if not a touch more. Just a touch of the throttle and your over 2k instantly
and only diesel engines make power that low and who knows how many parts will exit a diesel if it tred to rev like a gas engine
 

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I've got a set of Detroit Diesel 6V92's in my boat and there is nothing that sounds better than them purring around 1800 rpms
 

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