MagnaFlow Street Series Performance Exhaust Systems 15897 - Chevelle Tech
Headers and Exhaust Discussion related to Exhaust systems and headers.

 
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post #1 of 10 (permalink) Old Jul 2nd, 20, 7:42 PM Thread Starter
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MagnaFlow Street Series Performance Exhaust Systems 15897

I have manifolds now and want to keep them untill I do a engine upgrade in the future so I was wondering if anyone has tried using the flowmaster manifold downpipe kit part number 81071 and how it lines up with a full system like the one below?

So the questions are:
Does anyone have this exhaust system?
Do you like it?
Is it a do it yourself install on the garage floor with jackstands?
Is it the right width to possibly line up with the manifold downpipe kit above and make the garage floor install possible with some adapter to go 2.5" to 3"?
Or not worth the hassle and take to exhaust shop?
Because the magnaflo system looks to be band clamp install so easy to do.
Thx,
D
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post #2 of 10 (permalink) Old Jul 2nd, 20, 10:34 PM
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Re: MagnaFlow Street Series Performance Exhaust Systems 15897

Those downpipes will work, as will these https://classicmusclecarexhaust.com/...k-log-manifold provided you have a big block. If you have a small block, you'll need these https://classicmusclecarexhaust.com/...k-log-manifold or these https://classicmusclecarexhaust.com/...steel-flo81068. There will be some trimming for sure with that 3" system, and properly fitting 3" tailpipes can a challenge. What is your HP? You won't see much benefit unless you're in the 550hp range. If your below that, you might be happier with a 2.5" system.
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post #3 of 10 (permalink) Old Jul 3rd, 20, 1:27 AM Thread Starter
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Re: MagnaFlow Street Series Performance Exhaust Systems 15897

The current engine is the L34 it came with but 230ish duration cam, dual plane weiand intake and holley 750, so 2 1/2" would be more than enough.

3" because 396 chevelles usually grow up to be 468-496-540 chevelles when they hit the eventual growth spurt.

It'd like buyin' your kid's shoes/clothes bigger then they need now.

D
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post #4 of 10 (permalink) Old Jul 3rd, 20, 4:18 PM
blm
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Re: MagnaFlow Street Series Performance Exhaust Systems 15897

I have that system in a 2 & 1/2 inch version. I am very happy with it and install was easy on jackstands. Dont know about the downpipe as I have had it only with headers.
Was running the original 396 at first but now running a 496 and the 2 & 1/2 is fine.
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post #5 of 10 (permalink) Old Jul 3rd, 20, 8:26 PM Thread Starter
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Re: MagnaFlow Street Series Performance Exhaust Systems 15897

Quote:
Originally Posted by blm View Post
I have that system in a 2 & 1/2 inch version. I am very happy with it and install was easy on jackstands. Dont know about the downpipe as I have had it only with headers.
Was running the original 396 at first but now running a 496 and the 2 & 1/2 is fine.
Thx Brad,
what gears do you have in rear and how stout is the 496?
Are the muffs quiet enough to speak to your buddy/wife without yelling at each other while cruising at 50-60?
I don't want headache after 1/2 hour noise levels.
What you normally hear with Magnaflo is they are pretty quiet till you start to push into it.

Thx,
D
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post #6 of 10 (permalink) Old Jul 3rd, 20, 8:48 PM
blm
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Re: MagnaFlow Street Series Performance Exhaust Systems 15897

I have a 3:73 rear end and a 5 speed manual trans. The 496 is just below 600 for horsepower and torque. The exhaust is nice and quiet till you stomp on it then it really wakes up. No problem with noise while cruising however I am doing so in about 2,200 rpm due to the overdrive trans. It would be different at 3,300 rpm.
One thing about not just this exhaust but I would think any system. Being assembled with clamps is the way to go. I have had to remove my exhaust a few times and cant imagine doing so if it was welded. The only part I welded was the polished tips.
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post #7 of 10 (permalink) Old Jul 3rd, 20, 9:29 PM Thread Starter
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Re: MagnaFlow Street Series Performance Exhaust Systems 15897

I think Magnaflo is a pretty safe bet for low noise and good unimpeded flow...
And,
Yup x-pipe is no es bueno without clamps to facilitate easy removal.
Thx,
D
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post #8 of 10 (permalink) Old Jul 4th, 20, 9:23 AM
blm
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Re: MagnaFlow Street Series Performance Exhaust Systems 15897

One thing I did do when I had the system removed for other projects was I upgraded some of the clamps. There are several different styles and widths available. Got them from Summit.
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post #9 of 10 (permalink) Old Jul 5th, 20, 12:24 AM Thread Starter
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Re: MagnaFlow Street Series Performance Exhaust Systems 15897

Yes should be easy to find clamps that work if needed in the future and no limit to the times one could R+R it unlike the regular pinch clamps. Win Win.
D
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post #10 of 10 (permalink) Old Jul 7th, 20, 1:17 PM
 
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Re: MagnaFlow Street Series Performance Exhaust Systems 15897

Thanks all. This info has been really helpful.



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