4 into 1 or 4 into 2 exhaust

[bandet01]

so i need new exhaust and have been looking around. the set i like is a into 2 setup but i keep seeing 4 into 1 setups too, so what are the advantages of the 4 into 1 over the 4 into 2 or vise versa. i want to keep the center stand too and i hear you can only do that on a 4 into 2 setup. and can you guys give me some other companys that make pipes for the xs other then mac

[Jerry]

Theoretically the 4 int 1 pipes will give you a bit better performance due the the exhaust pulses helping pull more of a fresh charge into the cylinder head; this is known as scavenging. The effect is stronger at certain RPM ranges, not the same across the board. Because of this effect it is common to have to re-jet your carbs. In many, not all, cases you loose either the center stand and/or access to the oil filter, meaning you have to drop the pipes to chang the filter. This varies by brand of exhaust. Do a search on past threads; tis topic has been covered quite a bit.

I like the 4 into 2 for cosmetic reasons. The jardine system I run does not interfere with either the oil filter or center stand. it does 'cross over' the pipes from stock, (stock is 1,2 to left, 3,4 to right) which improves scavenging a bit but some don't like the looks of this arrangement. I do, so your choice can come down to a matter of personal preference.

2 into 1 systems tend to retain the crossover pipe between the mufflers, which supposedly ads to low-end torque.

I don't think anyone but Mac, in the US, is making new systems for the XS, but a few people have mentioned building new pipes. Again, do a search on exhaust or headers and go through the past threads.

[bandet01]

so mac is the only company making a new 4 into 2 setup or are there other 4 into2 companys out there

would a 4 into1 setup be better for drag racing every day street riding

so jerry do you have the 4 into 1 system on your bike and did you have to get rid of your center stand and do you have to drop the pipes to change the oil and filter

[TopCatGr58]

Bandet01,

The MAC systems promote and advertise that you are able to maintain your center stand function, and have easy access to oil filter without pulling the pipes off!!

I've got an old 4-1 I got from JCW back when they sold complete systems, and it's fine for daily riding as well as when I want to get on the pipe. It possibly have a reduction of low rpm grunt, but I've got the little big bore kit in it, and I never run it below 3K anyways, so I can't speak for how other stock bikes run below 3k, but that's in the lugging rpm range, and I dont' suggest running it that low......it's not a harley, it likes to REV!!
T.C.

[bandet01]

i never run mine low on the rpms i am always high in the rpms anyways, i am just a drag racer and i need new pipes but i like the way the 4 into 2 look so i was woundering if there is a company that makes a 4 into 2 that works as good as a 4 into 1 and how much am i going to loose by going with the 4 into2 over the 4 into 1

[TopCatGr58]

On Ebay a while back I saw someone selling these "X" style 4-2 pipes. I'll check and see if I can find them again. Don't know if it was just hype, or what, but were stated to provide.
T.C.

[Jerry]

I run a Jardine brand 4 into 2 system. Have never had a 4 into 1 on my XJ, so cannot speak for actual performance differences.

[Pat Kelly]

I had a friend years ago, Pat Eagan, that made "Maxi X Pipes".
Mostly for Kawasaki's (he raced for them for awhile). They were neat. With the bike idling you could put a small piece of paper at one muffler and let go. The paper would suck into the muffler then pop out the other side. They made pretty good power. Not street-legal (they ran them anyway).
Pat won the Nationals in 400cc box-stock and street-production on a Honda Hawk (same bike I rode). He was very talented rider. He lost major sponsorship ti Wayne Rainey because Rainey was better-looking thus more marketable.
He and I would be battling the RD400 that everyone else was riding. Pat would lap me several times each race. He never rode on the street, only the track, and he was good.

[bandet01]

so performace wise nobody know what i am going to gain or lose over the 4 into2 or the 4 into1

[chevy45412001]

?

i think when it comes to the 4-2 or 4-1 aftermarket you would be surprised. the only time you would gain would be on the top end and then it's not a feel in the seat kind of improvement.my xj came 4-1 no baffle,rusted out back to stock with the 4-1 jetting no difference to me then found another 4-1, still no feel diff. rusted out that one,now back to stock....guess what? rusted out the stock system now...dang so i looking for a replacement 4-1. I like kerker myself.but they don't make em new now so ?whole thing is this...single thing i did to notice any real dif on my xj was to raise the needle ever so slightly,made a real quick throtle responce ...noticeable you can feel night and day. And thats all i have to say about that...

[bandet01]

well if there aint no real seat of the pants feeling exept on top end and the only time i use top end is drag racing i am thinking i am going to go with the mac 4 into 2 setup since i like the way the 2 pipes look coming out the back of the bike

[prometheus578]

MAC4 into 2

I've got Mac 4x2 on my 79F. The catalog doesn't say anything about removing the centerstand, but if I recall correctly, the instructions with the pipes do. Center stand will get in the way. I did a little creative bending(put a pipe on the leg of the centerstand that sticks out), and managed to bend it alittle. The part where you place your foot is what hits the bottom of the pipe. Centerstand hangs a little low, is noticable, I mean, you can see it when looking at the bike from the side, but it's still up high enough to not concern me. I wasn't about to remove it.. use it all the time.

[bandet01]

ok because i dont want to remove the center stand i use it all the time and it is how i warm the bike up befopre draining the oil and stuff like that and i feel alot safer when working on it with it on it center stand

[chevy45412001]

same token

less weight more speed

[Ken Talbot]

I lowered SWMBO's 'H so much I had to take the centrestand off, it dragged on even the most gentle turns. I keep in the carport and slip it on for servicing, then take it back off again when I'm done. It usually takes me more time to find it than to install/remove it.