Slip-ons vs. 2-1 Pipe
Grand HDF Member
Joined: Dec 2012
Posts: 3,782
Likes: 1,202
From: river
A decent 2-into-1 will always give better results, by which I mean the best torque curve. Two separate pipes may give slightly better HP, but will not be so strong in the low/mid range. I changed from TDs to a 2-into-1 on my Glide and lost 1HP, but gained 15% in the low/mid range, also the bike runs much smoother.
Road Warrior
Joined: Feb 2009
Posts: 1,727
Likes: 11
From: TN
Way too many peeps buy into this low end B.S. First of all, a Sportster is not real torquey, the crankshaft is tiny (compared to BTs), and it is a short stroke. Secondly, if you want performance out of a Sportster engine, why would you ever be below 3000-3500 rpm?
The stock Sportster already has a cross over pipe. Is that not in some ways similar to 2 into 1? At a savings of ~$600. The front and rear cylinder gases are mixed/ combined just like a 2 into 1.
fwiw, My N'ster in the avitar, when Stage 1, dynoed 79.8 hp and ran 120 mph at Bonneville, and that was with STOCK exhaust with only the baffles removed.
Bwana
The stock Sportster already has a cross over pipe. Is that not in some ways similar to 2 into 1? At a savings of ~$600. The front and rear cylinder gases are mixed/ combined just like a 2 into 1.
fwiw, My N'ster in the avitar, when Stage 1, dynoed 79.8 hp and ran 120 mph at Bonneville, and that was with STOCK exhaust with only the baffles removed.
Bwana
Thread Starter
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Grand HDF Member
Joined: May 2006
Posts: 3,636
Likes: 1,208
From: Ohio
Thanks for all the feedback guys. I have always understood the crossover to simulate the benefits of a 2-1...albeit to a lesse degree. That is why I asked. A set of cycle shacks are $150 vs the cost of a bobcat. But at the same time I don't want to spend a small fortune on engine parts only to leave power compromised by marginal pipes. I will probably talk withe the hammer guys since I am more than likely going with their kit.
Grand HDF Member
Joined: Dec 2012
Posts: 3,782
Likes: 1,202
From: river
Way too many peeps buy into this low end B.S. First of all, a Sportster is not real torquey, the crankshaft is tiny (compared to BTs), and it is a short stroke. Secondly, if you want performance out of a Sportster engine, why would you ever be below 3000-3500 rpm?
The stock Sportster already has a cross over pipe. Is that not in some ways similar to 2 into 1? At a savings of ~$600. The front and rear cylinder gases are mixed/ combined just like a 2 into 1.
fwiw, My N'ster in the avitar, when Stage 1, dynoed 79.8 hp and ran 120 mph at Bonneville, and that was with STOCK exhaust with only the baffles removed.
Bwana
The stock Sportster already has a cross over pipe. Is that not in some ways similar to 2 into 1? At a savings of ~$600. The front and rear cylinder gases are mixed/ combined just like a 2 into 1.
fwiw, My N'ster in the avitar, when Stage 1, dynoed 79.8 hp and ran 120 mph at Bonneville, and that was with STOCK exhaust with only the baffles removed.
Bwana
Grand HDF Member
Joined: Dec 2012
Posts: 3,782
Likes: 1,202
From: river
Thanks for all the feedback guys. I have always understood the crossover to simulate the benefits of a 2-1...albeit to a lesse degree. That is why I asked. A set of cycle shacks are $150 vs the cost of a bobcat. But at the same time I don't want to spend a small fortune on engine parts only to leave power compromised by marginal pipes. I will probably talk withe the hammer guys since I am more than likely going with their kit.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Thanks for all the feedback guys. I have always understood the crossover to simulate the benefits of a 2-1...albeit to a lesse degree. That is why I asked. A set of cycle shacks are $150 vs the cost of a bobcat. But at the same time I don't want to spend a small fortune on engine parts only to leave power compromised by marginal pipes. I will probably talk withe the hammer guys since I am more than likely going with their kit.
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Grand HDF Member
Joined: Dec 2012
Posts: 3,782
Likes: 1,202
From: river
here are two different tq curves form a bike. Unless you take the 2 into 1 of your choice and tune it, then put slip ons on the bike and tune it, you really dont know. There are a ton of pipes out there that are good and some are not so good
2 different 2 into 1 pipes.....and totally different tq curves. just sayn
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
The top one is poor, the bottom one is good! If the bottom one could pick up a little more torque below 3,500rpm it would be great.
Hammer Performance show several dyno curves using their 1250 kit with 2-into-1 pipes, each of which give good torque curves.
Hammer Performance show several dyno curves using their 1250 kit with 2-into-1 pipes, each of which give good torque curves.