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About andrewos

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  1. andrewos

    Calling all Staintune owners

    I've been thinking about getting a full staintune exhaust for my DRZ400S - in part becuse it doesn't need repacking. I've seen from photos that the header is little bit wider diameter - but is also horizontal and shorter than the stock with it's much longer U-bend. From an earlier post TT folk have suggested that this shorter horizontal header might sacrifice low-end power to get mid-top end power gains. I was just wondering what Staintune owners found in terms of improved performance in low-mid-high ranges. Does anyone have any dyno curves that show the difference ?
  2. andrewos

    Help with aftermarket exhausts

    Sorry not to reply sooner - but thanks for a good understandable explanation. Cheers Robb. You've almost sold me on your hindle sytem with its stepped header (hadn't considered it before). How noisey is it ? I'm still leaning towards the Staintune - in part 'cos it needs no repacking - and where I am getting any bike parts is a real hassle. I'm not racing and don't get to spend nearly as much time off road as I'd like - but I reckon it's the mid range I'd want most gains - followed by low end and then top. So following what you say about shorter headers, I might lose a bit of low-end with the Staintune. But this makes me wonder about my original point - why if it makes little differene would Suzuki (and others) go to the extra effort involved in produced the longer U-bend - which seems to me to invite damage - rather then put in a straight horizontal (and may be stepped) header as stock ? Again, to show my ignorance, Staintune say that you don't need to rejet. I don't quite see how you can get performance gains unless they're sacrificing some part of the power curve to benefit another part (so losing low-end to boost high-end). So I'm just wondering if there is more of a loss at low-end than your suggesting. I'll do another post to see what Staintune owners think. Anyway, thanks - I'm new to all this and just stumbling around in the dark a bit - but your post has certainly helped.
  3. I’m thinking of getting an aftermarket exhaust. From all the posts it seems the general consensus is that if you want to really get the maximum benefits then you need to go full system rather than just slip-on. As far as I can work out from various threads this seems to be much to do with the stock header being too restrictive – and maybe that the full systems have wider & improved flow headers. But I’m wondering if there are any significant negative consequences (apart from the noise angle) of going aftermarket – and with less restrictive headers - for example if there’s a corresponding loss of back pressure and what effects this might have on the engine. One of many systems I was looking at is Staintune full system. It looks like the Staintune header is more or less horizontal, whereas the stock and other headers all seeem to have the much longer U-bend pipe. I presume Suzuki had good reasons for going for the extra cost and effort (and vulnerability to damage) of using the U-bend pipe. So my question is “why” ? What are the advantages of the U-bend pipe … and what does Staintune lose or gain by going the more direct route ? I think I remember reading somewhere that the U-bend was for low-mid end gains – so if this is true does this mean that the Staintune just shifts the dyno chart – with gains at the high-end at the expense of low-mid range power ?