high flow sv1000s exhaust headers

**Temporary-Kiwi** · 6th February 2019, 19:06

Hi, so my brother has talked me into making him a new exhaust for his sv1000s, I did some calculations and decided on basicly the same size as std diameter, but in a slight tapered style, which ive found gives increased acceleration thru boosting the torque curve, which is what he's asked for, more usable midrange.
so I've just removed the stock exhaust after getting a base dyno run, which showed 109.7 hp/ 66ft lb torque.
I must say the stock headers are terrible, especially the rear header, and all of the tailpipe aren't much better.
so I'm expecting it to improve to around 120hp
but mostly to increase roll on torque.

**AllanB** · 6th February 2019, 19:13

Keep us posted. 10hp is big gain to expect just from the exhaust (assume a custom map).

**Temporary-Kiwi** · 6th February 2019, 20:26

considering how bad the stocker is, it should be achievable, I am going to retain his yoshi mufflers, and the headers will be separate to each muffler.
yes it will get dyno tuned after, I'm still wondering how to post pics on this forum ?

**nzspokes** · 6th February 2019, 20:29

Im surprised at the lack of torque they have. Thought they were torque monsters. Guess not.

**AllanB** · 6th February 2019, 22:11

I'm pretty sure I've read on the SV forums a 2-1 punches out good power. Might be worth a troll through their site.

**Temporary-Kiwi** · 9th February 2019, 11:13

Originally Posted by AllanB

I'm pretty sure I've read on the SV forums a 2-1 punches out good power. Might be worth a troll through their site.

I did have a look thru there site, it does seem another problem may arise with my previous plan, individual pipes may alter power delivery even at std length.
so i investigated the two - 1 option, it's very tight fitting to get near stock pulse wave length, looks like il have to alter the oil cooler mt to reduce front header an extra 2 inches.
and make a curved collector to get it to fit at 660mm length header.

**98tls** · 10th February 2019, 14:49

Originally Posted by AllanB

I'm pretty sure I've read on the SV forums a 2-1 punches out good power. Might be worth a troll through their site.

Can remember a few on the TL site tried 2/1 but no power gains of much note,still got a 2 Bros 2/1 header setup in the shed that i had on the TL years back fwiw.

**98tls** · 10th February 2019, 15:01

Have a M4 exhaust on my old S and outta interest went looking for pics of an SV with same,came across this with 2/1 M4 setup,front header doesnt seem any closer than the setup on mine fwiw.

**Temporary-Kiwi** · 10th February 2019, 17:19

Hi, yes I looked at the m4 setup and the yoshi, they're getting around the problem by putting a crossover pipe before the collector, it's a compromise, yet I may have to do simular as it's not looking viable to get headers to join @ collector at the length needed.
he likes the idea of only needing one muffler though, otherwise I could replicate stock style of individual pipes with a crossover pipe.

**Temporary-Kiwi** · 19th February 2019, 22:05

Hi, so I've managed to get the headers equal length, made a short curved collector, fitted tailpipe up to one of his yoshi mufflers tonight, in the morning I'll reinstall the shock and give it a test run - then I'll know if I have to install a crossover pipe.
I'll take a couple of pics to post 2moro.
it certainly sounds sweet with the single muffler !

**Temporary-Kiwi** · 20th February 2019, 11:13

Hi, so I gave it a run - must say it's seems to going considerably better, more roll on torque, and much better power from 4k up all the way to "redline" , that in particular was poor before, above 8 k it previously felt anemic.
still have to go over it after a couple more runs to inspect for any cracks, as tapered header exhausts run very hot and will fracture any weak weld joints.
then I'll give it some hi-temp paint , while I'm waiting for a spot on brents dyno for some fuel tuning.

**Temporary-Kiwi** · 21st February 2019, 16:23

Hi, so I've got sv booked in for dyno tune on Monday
I've just painted the headers, took a couple of pics beforehand

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**layton** · 21st February 2019, 17:40

Looks the part, I have found that an orbital sander will remove and clean up the grinding marks quite well!

**Temporary-Kiwi** · 23rd February 2019, 19:03

yes i use a flap disc mainly to clean up the welds, I painted it, then remembered I was going to weigh it to see how much lighter it was, took it down town for a new wof, when I got back I See it's burning the hi-temp paint off !
I ordered a k&n air filter on Friday morning, motozone texted me this morning to say I could pick it up, so I've fitted that as well as opening up the snorkel to allow easier access for the air to get in. I checked the spark plugs- white as ceramics, so it's running very lean, be interesting to see what numbers it throws out, I'm fairly confident it's over 120hp @ wheel, but the torque feels much improved, and I haven't reset the cam lobe centers yet....

**layton** · 23rd February 2019, 19:58

Originally Posted by Temporary-Kiwi

yes i use a flap disc mainly to clean up the welds, I painted it, then remembered I was going to weigh it to see how much lighter it was, took it down town for a new wof, when I got back I See it's burning the hi-temp paint off !
I ordered a k&n air filter on Friday morning, motozone texted me this morning to say I could pick it up, so I've fitted that as well as opening up the snorkel to allow easier access for the air to get in. I checked the spark plugs- white as ceramics, so it's running very lean, be interesting to see what numbers it throws out, I'm fairly confident it's over 120hp @ wheel, but the torque feels much improved, and I haven't reset the cam lobe centers yet....

are they not 120 standard? or there abouts?