Hello everybody! Today another Hyundai i30N and maybe you saw a few posts of it on Instagram and Facebook. The car has a really high noise level, the N performance is about 108-109 dB in the papers, It’s much louder than a R8, our R8 V10+ is about 100dB in the papers. So 108dB is really loud for that type of car. In the exhaust system we found a restriction, you may guess that this video is about the flex pipe. The tightest part of the stock flex pipe has only a diameter of 55mm and today we want to compare both flex pipes: The OEM one with our upgrade flex pipe. OK, we removed the stock flex pipe and now I’m going to show you the diameter narrowing which we can find here. The stock exhaust is 65mm in diameter, and we’re at the inlet and outlet at about 63.5mm of inner diameter. But if I measure here at the flex pipe, you can see that we’re at about 60mm and this is a inner diameter of about 57mm. Our upgrade flex pipe is 70mm on the outside and 67mm inside, so that’s 38% more cross-section. I’m curious how much more power we can get out of the upgrade flex pipe. We put it on dyno before with the stock pipe and later we’re putting it on the dyno again. The turbo is running at it’s limit with our software and it’s happy about every exhaust gas backpressure reduction on the inlet and outlet side. According to my experience I’d say that we could get about 5-8 HP more power. And what’s interesting to me is, what happens with the sound? What I want to show you here: The flex pipe is well built with TIG welding. On the inside it’s welded by forming gas. We can find massive holders – not small pipes which are bent into holders. We can find a very stable flex pipe which doesn’t fall apart on the inside. We don’t have this typical wire mesh as many other manufacturers offer. When these flex pipes get a good amount of exhaust gas temperature, the wire mesh expands on the inside. If that happens – we saw it earlier on some cars – it looks like a sock which is inside out. It looks like a knot. This can’t happen with these type of flex pipes, because we can find a helix shaped inside. The flex pipe is made out of stainless steel and when comparing it to the OEM stock flex pipe, it’s made out of common exhaust steel. OK, I installed the flex pipe and it fits pretty good. You may need an hour to install it, because you have to remove the skid plate and install it again. I don’t recommend to do this at home. So, let’s go on the dyno again! There we are again: We put the Hyundai on the dyno and we can now compare both flex pipes. Unsurprisingly the flex pipe gains a few HP in higher engine speeds and how much it exactly does, I’ll show you now on the computer. You can see the maximum pwoer here, it’s about 315 HP as before, the blue graph is the input measurement with the stock flex pipe and the red graph is the output measurement with our upgrade flex pipe. The amplitude on the lower end is caused by a slipping clutch, so you can ignore it. Both graphs are nearly congruent in higher engine speeds, Here at 4.500 RPM we can see the peak power and you can see clearly The power is the same and keeps falling by the end of the graph. This is the reason because the turbo charger is small and it’s at it’s limit. In the midrange you can see nearly no change. If I set the curser on these positions, we can see 1-2 HP difference, that could be a tolerance, but what’s really important is the range between 5.500 and 6.000 RPM. When you look here, you can see the difference from 304 HP to 310 HP, maybe closely to 311 HP. This is a gain of about 6-7 HP and it’s remaining until 6.600 RPM, we can see a gain of over 8 HP, which is caused by the flex pipe. The flex pipe is now available in our online shop and if you have any questions for the i30N or for the parts we sell in our shop, please write a comment, call us, send us an e-mail, you can also write down your wishes for new videos, we’re planning to show you our working days here, what we do, which cars we’re on … So for example how we do the software. Just pass us a comment, and very important: Subscribe to our channel, then you’ll be always up to date. Now at the end we’re listening to the i30N! Have fun!