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Old 02-02-2018, 02:01 PM   #1
will16
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Default Exhaust Manifolds 160 v 143

Hi guys,

I'm redoing the exhaust on my mini, I have my 143 manifold/downpipe which I've been using since the conversion. I also got a 160 manifold/downpipe. I was told the 160 is better flowing, but the issue I'm having is that the 160 one is much bigger physically.

What I'm asking is will the 160 really make a big difference over the 143?

Rest of the exhaust will be 2" diameter with a 3" tip (yob )

143 set up


160 setup
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Old 02-02-2018, 02:32 PM   #2
AGoaty
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Two things. First is that it is physically bigger but only width ways so wouldn't think that will matter to you.

Second is the 4 bolt 143 had a huge amount of weld on the inside of the twin holes. I opened these up a vast amount when I built Phoenix. This alone must make it flow better.

I have both here if you would like me to actually measure the distance from the block.
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Old 02-02-2018, 04:06 PM   #3
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once the welds have been opened up on the 143 manifold the real world difference will be very little. I have tried a few different manifolds - 143 then a 160 (didn't notice any real difference), then a 340r large bore stainless which gave good top end but lost torque in the low to mid range, and I now have a modified janspeed mild steel manifold which seems to give the best all round performance.
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Old 02-02-2018, 08:43 PM   #4
will16
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Thanks guys, that confirms what I was thinking! The 160 sticks out the front alot further than my 143 one so think I'll just get the die grinder out
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