Ultimate exhaust... (1 Viewer)

[tiorio]

As most of you now know, I'm replacing a fair bit of my exhaust system (from the headers back). Ifin you was doing the same to your cruiser, what would be your 'ultimate exhaust'?

Here are the specs:

70% on road / 30% off
Must meet CA emission laws
More power!
Can't be too much louder than stock but should have a better sound...

So boys (and girls if applicable), what to do? :dunno:

Cheers!

 

[tiorio]

BTW: Thanks for all the help diagnosing probs and ideas with the earlier exhaust thread, you guys rock!

 

[bjowett]

Whew, where to start.... I'm no engineer, and exhaust theory and design can get busy in a hurry, so I'll keep it short. Copy the design of the stock system with a few exceptions - The downpipes off of the manifolds are definetly an area where some gain could be had. Stainless mandrel sections of a slightly larger tube diameter down to some real hi-po converters, large internal honeycomb, 2 of em'. Two slightly larger tubes out of the converters back to a dual in Borla hemi/truck (don't know what they call them these days)or similar stainless straight through muffler, single 2.5 or maybe a 2.75" outlet back to a small stock style Borla/similar resonator and end it with the same tip outlet diameter.

 

[tiorio]

So what are the CA laws regarding replacing the cats? Can I use aftermarket or no with factory still available?

Is the Y pipe a significant restriction or is the bigger problem with the muffler itself (assuming the factory cats have to be retained)?

Can I get Borla cans without buying the whole exhaust?

Seems the rigs exhaust system could net quite a few HP looking at the stock system, no?

 

[BigMac]

Tiorio-
Did you ever decide on an exhaust? I was over at Man-a-Fre (Simi Valley) a couple of weeks ago and looked at their stainless "cat back" system. They use it when doing turbo installs. &nbspidn't pull the whole thing out of the box, but it looked like it was made of heavy gauge material and designed to flow better than stock. Not cheap at ~$500. The hard part for a DIY would be getting the original system unbolted from the cats or replacing them.

Has anybody installed this system?

Thanks, BigMac

 

[tiorio]

Hmm, an option I hadn't researched much...

My only issue is that I gots the major problems of rust and I don't think the mated parts are a-comin' apart without a torch. I very well could be wrong and have started the PB Blaster treatment and will give it a shot this weekend...

Thanks for the info!

 

[Guest]

BigMac-is that Man-a-Fre exhaust for an 80 series?--i didnt see it on the website so i am wondering,just saw listing for 40's....

tiorio--i am sure you can get a Borla muffler seperate,try jegs/jc whitney/borla website......

one another note,the borla website now lists their catback exhaust for the 93-97 1FZ-FE powered cruisers again(only the V8 system was offered for a while),and at 457.99 seems like a good deal(compared to spectors 750.00) for the quality they offer(WARNING,christo says the tip can be damaged by extreme wheeling)

doug

 

[cruiserdan]

The Borla tail pipe can be modified to gain additional clearance. In it's original state it exits way below the bumper end. I stuck a few well placed wood blocks between the body and the exhaust, took my RH bumper end off and used a floor jack to do a controled upward bend of the tail pipe. I pushed it up almost 2 inches. It is now well above the stock tail pipe. I then took a 4 inch hole saw and cut a half circle out of the bottom of the bumper end and put it back on.

 

[Beowulf]

Here are some pics of C-Dan's Borla.

-B-

 

[cruiserdan]

Thanks B,

I forgot you had those........

 

[tiorio]

Ahhh! So it's not the can itself on the Borla that causes the problem, but the tip! That makes a difference (a pic IS worth 1000 words, thanks B).

Of course the problem of the Y pipe still comes into play. I've still got a few CARB regulations to sort out before I decide ifin I have to go Kansas City rebuilt or fully custom. Any CA smog gurus out there?

 

[Junk]

Mainly OEM then just custom bend all the pipe up above the frame rails. who cares about sound or looks anyway

.... saw a nice rhinolined 80 this weekend - prob wouldn't be able to tell the diff in the sound with that . :wickedslaptoface:

 

[BigMac]

Doug -
The Man-a-Fre exhaust was for an 80 series. Their part number FZJ80-3CB. According to their catalog it's a 3" system with aluminized tubing, and a stainless muffler. They offer a matching 3" cat for $375. Look under the "C" tab on their website. BigMac

 

[DRTDuck]

C-Dan,

What is your feedback on the Borla? I have seen where others weren't that inmpressed with it (they were expectng more of a power change) once in stalled.

How about the sound, more than stock, but less than an Dyno or Flow?

Can this be a DIY job or would it be a good idea to take it to your local muffler shop?

 

[Guest]

I got a quote for my BJ40. The Exhaust will go from the Exhaust Manifold to then exit infront of the rear right Tyre with a Straight Through(Hot Dog) Silencer(Muffler). Australian $150 -> $175 8)
In Australia it is very exspensive for pre fabricated Exhaust Systems. But Custom is better anyway.

 

[cruiserdan]

DRTDUCK,

 I happen to like mine. It is louder than stock in a fashion that is plesant to my ears. Some may not like it. I have not heard a flowmaster other than the audio clip posted on SOR. IIRC, the tone was similar. The muffler is smaller in diameter than the stock unit. Therefore it sits a bit higher. As far as a performance gain it's a difficult call. I do know that the exhaust scavenges better because I noticed a slight drop in boost pressure after the install. I have spoken with several people in the "know" and the consensus was the boost drop was caused by a freeer flowing exhaust. Dyno runs BY TRD have shown boost drops on engines after headers for example, but the engine still makes more power than before.
 I installed mine myself. A hoist is useful, also the tail pipe is a bit of a trick as the over-the-axle part is not "flat" like the stock pipe so you have to play with it a bit to snake it thru.
I would not put one on a trail truck unless you bend it up like I did. You will surely smash it good and proper if you don't.
I also like the fact that it is stainless. One doesn't generaly find generic stainless exhaust piping in must muffler shops. It certainly costs a bunch more but unless you smash it up you should only buy it once.

Dan.