EXHAUST ADVICE
#1
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EXHAUST ADVICE
I am thinking about redoing my exhaust from the cat back. I was going to go to a reputable performance shop & have them replace the primary muffler, with maybe a magnaflow-dual in & dual out, & then run 2 pipes out the back in the appropriate area. Does this sound OK or is there anything I need to know?
Thanks!
Thanks!
#2
Race Car
Someone did that with my former '85. Sounded outstanding at idle, but WOT was a matter of taste. These cars are very loud compared with many others, I assume because perhaps the combustion chamber isn't as shrouded as some other V8s. Just make sure its a good shop, the stock path for the pipes is tricky particularly where it goes under the cross member. Some have routed pipes to opposite sides, but you can end up with disparate lengths then, not ideal. Be sure to check out your options for pre-made exhausts, 928 motorsports offers a new dual midpipe/muffler setup, might be apropose if you are already set up for dual-in. I assume you're already runnning an aftermarket pipe just aft of hte manifolds with a good crossover arrangement? That seems to be a key part of the equation.
#3
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Rob
For that type of investment (custom exhaust)....an "X" pipe with stock or RMB would be a better investment....you would gain a solid 20+ hp and it would be far louder....at least with the RMB....
For that type of investment (custom exhaust)....an "X" pipe with stock or RMB would be a better investment....you would gain a solid 20+ hp and it would be far louder....at least with the RMB....
#4
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Since you have a EURO the BIG question is what kind of Cat do you have the Porsche cat was over $2,500 so MOST federalizing labs did NOT put on the correct cats ...often small restrictive cheap were used.
#5
Racer
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My exhaust system is totally stock.........Looks like the cat was added later. Welds dont look too pro like! My cat is actually pretty big & long. Sounds like me Seriously, the cat is dual in & dual out. I am not looking for an awsome setup at this time, since I have so much other stuff that I want to address first. My secondary muffler hangs a little too low & looks sad. The 2 pipes between the primary & secondary mufflers are pretty pinched in the usual area, & are rusty. I dont want to spent alot of $ on it. Just clean it up a little & give it a little V8 rumble. The shop I use here in Vegas, Performance Muffler, is very good at custom work. I need to go & see what they can do & for how much. I realize the routing will be very important for clearance issues.
#6
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I loved the sound of my euro, with a flowmaster, and monza resonator tip.
http://www.thedeathknight.com/928/928_Test_Drive.wmv
http://www.thedeathknight.com/928/Fl...WindowOpen.MPG
http://www.thedeathknight.com/928/Fl...ndowClosed.MPG
Flowmaster alone was too loud.
And since you need some kind of tip anyhow, use one with a resonator.
It sounds like you may have the same cat I did, which is probably an s4 cat, grafted on...
They are long, dual cats...
http://www.thedeathknight.com/928/928_Test_Drive.wmv
http://www.thedeathknight.com/928/Fl...WindowOpen.MPG
http://www.thedeathknight.com/928/Fl...ndowClosed.MPG
Flowmaster alone was too loud.
And since you need some kind of tip anyhow, use one with a resonator.
It sounds like you may have the same cat I did, which is probably an s4 cat, grafted on...
They are long, dual cats...
#7
Drifting
Originally Posted by Jim bailey - 928 International
MOST federalizing labs did NOT put on the correct cats ...often small restrictive cheap were used.
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#8
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The 1985-1995 big "dual" cat is a direct bolt on and designed to work with 300+ HP. But the point was that the unknown added on cats are usually small and often very restrictive.
#9
Racer
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Originally Posted by bcdavis
I loved the sound of my euro, with a flowmaster, and monza resonator tip.
http://www.thedeathknight.com/928/928_Test_Drive.wmv
http://www.thedeathknight.com/928/Fl...WindowOpen.MPG
http://www.thedeathknight.com/928/Fl...ndowClosed.MPG
Flowmaster alone was too loud.
And since you need some kind of tip anyhow, use one with a resonator.
It sounds like you may have the same cat I did, which is probably an s4 cat, grafted on...
They are long, dual cats...
http://www.thedeathknight.com/928/928_Test_Drive.wmv
http://www.thedeathknight.com/928/Fl...WindowOpen.MPG
http://www.thedeathknight.com/928/Fl...ndowClosed.MPG
Flowmaster alone was too loud.
And since you need some kind of tip anyhow, use one with a resonator.
It sounds like you may have the same cat I did, which is probably an s4 cat, grafted on...
They are long, dual cats...
BTW, I have only one cat, but with dual outlets in & out. Or do you mean 1 cat after another? I may have that!
Thanks for the clips.......something to think about!!
#10
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Try a Flowmaster 50-series.
They are quieter than the 40 series, but still have that deep rumble.
And those clips are loud, because I am really on the gas.
Most of the time, for normal street driving, it was not too loud at all.
They are quieter than the 40 series, but still have that deep rumble.
And those clips are loud, because I am really on the gas.
Most of the time, for normal street driving, it was not too loud at all.
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I have an 84 Euro engine in my 1980 928. I tried an X-pipe into a single 3 inch then into 2 Borla's in series. Sounded HORRIBLE....unless you like it so loud you can't carry on a conversation with the passenger. At WOT it was vicious, at freeway cruising speeds it was unbearable due to the droning and resonance. So I ditched the X-pipe and installed a stock S-4 cat. Now it is perfect. So with X-pipe and Borlas = vicious snarl. With stock S-4 cat and Borlas = angry growl.
Also, with this set-up (S-4 cat + single pipe + Borlas) I gained over 20 RWHP vs. the stock 1980 small exhaust.
Rich
Also, with this set-up (S-4 cat + single pipe + Borlas) I gained over 20 RWHP vs. the stock 1980 small exhaust.
Rich
#12
Banned
Rob,
check out this true 2.5 dual exhaust system I had fabricated for my early 86.
Includes two bullet style resonators and a final magnaflow muffler. Exhaust note is very exotic. Cost was
~1k.
Good Luck
Rich
check out this true 2.5 dual exhaust system I had fabricated for my early 86.
Includes two bullet style resonators and a final magnaflow muffler. Exhaust note is very exotic. Cost was
~1k.
Good Luck
Rich
Last edited by RDS928S; 08-26-2014 at 05:08 PM.
#13
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Rob: Go look up the recent exhaust thread by Carl Fausett. He's developing/developed some new exhaust (catback) systems. I'm testing the pipes for the later version for him on my '91-we've got some fitment issues we're working thru, but he's got a version for older cars already tested that fits, and dyno'd well for him.
#14
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Originally Posted by RDS928S
Rob,
check out this true 2.5 dual exhaust system I had fabricated for my early 86.
Includes two bullet style resonators and a final magnaflow muffler. Exhaust note is very exotic. Cost was
~1k.
Good Luck
Rich
check out this true 2.5 dual exhaust system I had fabricated for my early 86.
Includes two bullet style resonators and a final magnaflow muffler. Exhaust note is very exotic. Cost was
~1k.
Good Luck
Rich
We'll see! Thanks all for the advice!! Always appreciated!