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post #1 of (permalink) Old 03-21-2004, 03:29 AM Thread Starter
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Open or muffled exhaust on a nearly stock Sammy

My '87 Sammy is nearly stock with the ECM'd Carb. It's time for a new exhaust system. I'll be using the original exhaust manifold. The local Sammy offroaders reccomend removing the cat, running a 2" pipe to a Turbo muffler, then necking down to a 1 7/8" tail pipe. They say the smaller tail pipe improves low end torque. They say the ECM will compensate for no cat/reduced back pressure. What's everybody think about this? I don't have to pass inspections or emissions testing were I live.

Also, I'm toying with the idea of running a straight 2" pipe from the original headpipe clear to the back. Would this be way too loud? (I wouldn't want Law Enforcement looking underneath, as this is a daily driver vehicle). Maybe I could put one of those tuneable buzz bomb mufflers at the end of the tail pipe. I'm talkin' about the expansion chamber/stacked baffle type muffler some of the import hot rodders use, they tune them by adding or removing baffle plates. My departure angle would not suffer, because I goin' to keep to stock liscense plate guard/rear hitch bar on, and the muffler would tuck in next to it. So, what do you all think? Straight pipe? Buzz Bomb muffler at the end? Would it sound like a WWII Zero fighter plane?...just kiddin' about the Zero sound.. but I'm seriously considering the rest.
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post #2 of (permalink) Old 03-21-2004, 09:17 AM
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Re: Open or muffled exhaust on a nearly stock Sammy

How about an old fashioned exhaust cutout? You can have a street system with a real muffler tucked way up underneath and have a cutout into a straight 2" pipe for whenever you needed the noise and slight extra power.

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post #3 of (permalink) Old 03-21-2004, 11:32 PM
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Re: Open or muffled exhaust on a nearly stock Sammy

Just use good 2" pipe and a decent turbo muffler with the tail section clear back to the rear bumper . This will keep decent back pressure and still sound good without attracting too much attention of the wrong type . Without an O2 sensor the stock carb and ecm will get confused big time though , might want to do a cat-back setup.
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post #4 of (permalink) Old 03-22-2004, 01:39 AM
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Re: Open or muffled exhaust on a nearly stock Sammy

I bought a 2" turbo muffler and had my buddy custom bend the whole system for me. He took it upon himself to run 2 1/4 pipe from the maifold to the muffler and 2 1/2" after the muffler to a 3 1/2" tip.

While it looked cool and sounded awesome, it did NOTHING to improve performance.

The engine was entirely stock.
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post #5 of (permalink) Old 03-22-2004, 01:37 PM
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Re: Open or muffled exhaust on a nearly stock Sammy

From my opinion I think the real power increase comes from the header. If your going to only do cat back or remove cat I would go no bigger that 2 inches. I did dual cherry bomb muffers and ran them on an angle to exit out of the side right before the wheel wells. felt tons of extra power and it sounded really nice not too loud but loud enough to sound strong. But I also had a modded K &N intake and a thorely header. I know you said the engine is stock how bout lift, is there any.
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post #6 of (permalink) Old 03-22-2004, 05:32 PM
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Re: Open or muffled exhaust on a nearly stock Sammy

In my experiance the BEST mod you can make is to replace the complete exhaust system from the manifold back with 2" pipe (do not exceed this size with a 1.3 or you will lose power/torque noticeably) and run the Dynomax Super Turbo muffler and a high flow cat (to keep you legal). You WILL notice more improvement with this setup than with any other exhaust modification. A header is a great idea if especially if you have a cracked manifold, but you won't feel the power as much as you will by adding the 2" exhaust. After installg the above system on a friends Sammy with a 1.3 I can honestly say that top speed went from 70mph to almost 80mph....then after adding a K&N intake he could go over 80mph and that was with 29" Swampers and no gears.

Hope this helps you make your decision.

Sean DeVinney
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post #7 of (permalink) Old 03-22-2004, 06:09 PM
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Re: Open or muffled exhaust on a nearly stock Samm

i have noticed on a lot of samurais the pipe coming down from the exhaust manifold will be internally rusted and partially collapsed. like has been mentioned, replace all the tubing.

for a cheap-man's header for a 1300, install a 1600 8v stock exhaust manifold for better flow.

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