Topic: Why 4-1 vs 2-2?

[OllieCB]

It seems like many on the forum prefer the 4-1 exhaust as an upgrade vs the 2-2. I'm curious - why? Performance? Looks? Ground clearance?


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[1974 Honda 550k]

I am a 2-2 guy myself

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[CarbonK]

I can't speak for 2-2 because I've never had one, my bike came from the PO with a 4 into 1 chopped at the muffler. I'm not overly fond of the noise but think of all the weight savings versus a full 2-2 haha.

[Honda Alan_UK]

I have a 4-2 system. I prefer the look of the muffler each side, looks more in keeping with the age. And when I'm richer, thinking of buying a repro set of 4-4 pipes. 

[riverfever]

I had a 4-4 and knew I'd replace it eventually. I also like the look of the 4-2 but couldn't justify the price of the system I wanted for my project (Benjies). And that's not me saying his system is worth what he's asking. It's beautiful. It's more about the cost of my project and what I wanted to put into it. I ended getting a Motogp 4-1 and love it.

[Mantree]

I don't much like the 4into1 because I always scrape

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[Scott S]

 I never liked the 4-2 offerings mostly because of the turn out on the mufflers. A throw back to the chopper days. Or the flared bell mouth look.
 I'd be much more interested in a 4-2 with reverse cone or taper tip mufflers.

[Pan1cReaper]

I like the sound better. 

[FunJimmy]

I never liked the 4-2 offerings mostly because of the turn out on the mufflers. A throw back to the chopper days. Or the flared bell mouth look.
 I'd be much more interested in a 4-2 with reverse cone or taper tip mufflers.

Agreed!

[Scott S]

 I recently picked up an RD350 and found out about Hydro-formed chambers. If someone would make a set of Hydro-formed mufflers in the CR style.... drool...

 (Yeah, it's 4-4, but  DAYUM!...)

[Don R]

 I have a hooker 4-2 that came off my K0 and it was the best sounding pipe I've ever had on a 750 They look good too, I even have a modified center stand that fit it.

[kmb69]

I'm no exhaust expert but most 2-2's are not done right IMHO. The 1-2-4-3 firing order requires 1-4 and 2-3 pipes for balanced 2-2 exhaust pulses. Maybe the best performance is 2-2-1 judging from what most of the hot Kaws and Suzs are running at the dragstrip.

[BomberMann650]

I recently picked up an RD350 and found out about Hydro-formed chambers. If someone would make a set of Hydro-formed mufflers in the CR style.... drool...

 (Yeah, it's 4-4, but  DAYUM!...)

Now that's a proper set of race pipes!  Woweee!

[beemerbum]

IMHO the very essence of the SOHC 4 cylinder is the look of four separate exhausts as seen from the back. Anything else is less than adequate.

[christopherk]

IMHO the very essence of the SOHC 4 cylinder is the look of four separate exhausts as seen from the back. Anything else is less than adequate.

Wonder why a 4-1 was stock on the 750Fs then?

[Stev-o]

I have a hooker 4-2 that came off my K0 and it was the best sounding pipe I've ever had on a 750

I had a Hooker on a K5 and did not like the sound, too quiet.  Wonder if we had different baffles?

[JWExperience]

Performance wise, I believe that combining all four pipes into one results in improved high rpm performance where 4-2 would be better towards the mid range. I read this when looking into exhausts in general, sounded like different exhaust setups would move the power band around a little. 4-1's were good for race tracks and the 4-4 would be better for the street with improved midrange. That's just my general understanding with regards to performance.


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[Oz350Four]

I'm going with a 4 into 2... just need a little welding done then its off to a shop to get blasted and painted matt black...  The bike came with 4 into 2 but the mufflers had more holes than swiss cheese... had 2 converging parts made to slot onto the old headers and onto the new mufflers..

[Mantree]

I have a 4into2 that crosses over 1, 3 and 2, 4 it has a much deeper tone and good pulling power at highway speed the 4into1 that I had my last 750 was a very nazley drone with better full throttle but not as pleasant at freeway
I also have a hotter cam
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[beemerbum]

IMHO the very essence of the SOHC 4 cylinder is the look of four separate exhausts as seen from the back. Anything else is less than adequate.

Wonder why a 4-1 was stock on the 750Fs then?

The novelty had worn off. Honda was hoping to revive the fading SOHC 4 with a "new" look.

[cougar]

A properly designed 4>2>1 has the best Overall performance that you can get !   ...cougar...

[Duke McDukiedook]

I never liked the 4-2 offerings mostly because of the turn out on the mufflers. A throw back to the chopper days. Or the flared bell mouth look.
 I'd be much more interested in a 4-2 with reverse cone or taper tip mufflers.

Agreed!

Thirded! 

[OllieCB]

I never liked the 4-2 offerings mostly because of the turn out on the mufflers. A throw back to the chopper days. Or the flared bell mouth look.
 I'd be much more interested in a 4-2 with reverse cone or taper tip mufflers.

Agreed!

Thirded! 

Interesting. Maybe I just wasn't around when the 2-2s were first popular and don't have the negative associations.

[Retro Rocket]

A properly designed 4>2>1 has the best Overall performance that you can get !   ...cougar...

Yep, its all about performance for me and a 4 into 2 into one is the superior pipe. Mantree, one of the reasons a 4 into 1 is better is because of clearance, use a decent pipe and it won't scrape..

[FunJimmy]

A properly designed 4>2>1 has the best Overall performance that you can get !   ...cougar...

Yep, its all about performance for me and a 4 into 2 into one is the superior pipe. Mantree, one of the reasons a 4 into 1 is better is because of clearance, use a decent pipe and it won't scrape..

I might have questioned the difference until I switched to a 4 into 2 into one system. Now I have no doubts at all. This is the champ!