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post #1 of 9 (permalink) Old 12-07-2014, 08:25 AM Thread Starter
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Strange Request

I plan on replacing the exhaust on my 1971 spider (euro)over the winter. My choices seem to be the stock system, the stock system with stinger rear section or a magnaflow stainless steel system.
I would like to use the magnaflow system but I have heard it is loud. I understand the loadness is subjective and therefore I am asking if anyone in the southern new england area has this system installed so I could hear it. I am willing to drive to your location and listen to it.
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post #2 of 9 (permalink) Old 12-07-2014, 09:03 AM
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I had a Stinger + the stock center resonator on my Spider and it was LOUD. I now have a single Borla straight through muffler in the center position and everything else is straight tube. It is louder than stock but it is not obnoxious. See posts 72 & 74 of this thread Weber tuning with Lambda sensor

Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #3 of 9 (permalink) Old 12-08-2014, 09:49 AM Thread Starter
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Ed, I like the sound you have with the Borla straight through muffler. I don't think I have the skills to make the custom piping as you did though.
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post #4 of 9 (permalink) Old 12-08-2014, 10:50 AM
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I didn't make the pipes - I paid $300 for someone else to do it - including pipe, flanges, tail pipe, etc.

Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #5 of 9 (permalink) Old 12-08-2014, 10:59 AM
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Quote:
Originally Posted by alfaparticle View Post
I had a Stinger + the stock center resonator on my Spider and it was LOUD.
I can vouch for this: when my rear muffler was shot (effectively making it a stinger) it was d-mned obnoxious sounding. I'd cross the stinger off the list if you're concerned about sound.

Tom

1991 Spider
1963 Giulia Spider (1750 engine)
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post #6 of 9 (permalink) Old 12-08-2014, 11:23 AM
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If this coming weekends weather holds out, you're welcome to come kick the tires on the 71 GTV. It has the 2 1/4" stainless Magnaflow. Morristown, NJ area.

Jim

Series 2 USA 1750 GTV (in Series 1 European clothing)
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post #7 of 9 (permalink) Old 12-22-2014, 08:30 AM
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Quote:
Originally Posted by alfaparticle View Post
I had a Stinger + the stock center resonator on my Spider and it was LOUD. I now have a single Borla straight through muffler in the center position and everything else is straight tube. It is louder than stock but it is not obnoxious. See posts 72 & 74 of this thread Weber tuning with Lambda sensor
On 2L stock Euro 135hp Alfetta in a Super. I now have a 1 5/8" header w/ 2 1/8" GTA-R system but with a rear stinger and I removed the front collector because it started rattling. The middle is an IMASAF muffler. It is loud but has a nice deep burble.

The question: I am told by exhausts purists that you need a front collector of some sort to develop proper scavenging, dissipation of pulses, and establishing constructive backwaves (??). I felt no change in performance removing the collector? Whaddya think?

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post #8 of 9 (permalink) Old 12-22-2014, 09:24 AM
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Quote:
The question: I am told by exhausts purists that you need a front collector of some sort to develop proper scavenging, dissipation of pulses, and establishing constructive backwaves (??). I felt no change in performance removing the collector? Whaddya think?
I have no collector on my Spider, just a Shankle 4-2-1 header into a straight pipe with a single muffler in the position that was once occupied by the resonator. My dyno sheet was with the same headers into a stock resonator and rear muffler and it shows a very flat torque curve which I think is desirable. So my conclusion is that a collector is unlikely to add much.

Al Mitchell also told me that he has experimented with collectors on his GTV6 racer on his dyno and he saw no advantage from them.
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Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke

Last edited by alfaparticle; 12-22-2014 at 09:32 AM.
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post #9 of 9 (permalink) Old 12-22-2014, 09:35 AM
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Thanks Ed, I did not feel a difference before/after (in my calibrated keister) but it is not a high performance racing engine that is operating at the margins. Funny that racers bolt side exhausts right up to the header flanges (where allowed by noise regs) but then say in the next breath that you need a proper collector. They cite Kartamalikis, et al.
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