Flowmaster 300 Series Vs 400 Series - Team Camaro Tech
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post #1 of 3 (permalink) Old Dec 16th, 05, 09:41 AM Thread Starter
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Tom
 
Join Date: Jul 2004
Location: San Diego, CA
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Cool Flowmaster 300 Series Vs 400 Series

Ok guys, we got the body work done, the Pearl Blue Micro Metalic Flake paint is being applied now, z28 stripes to follow, etc. I'm now ready for my exhaust since we had to chop it up so much to restore the car (it's a long story). I'm going with some short headers, 2" seemless aluminum pipes and I have two large decisions to make.

You guys have not let me down yet so I will lean on you again for your opinions and supporting pix if you can...

First:

Do I go with the 300 series Flowmasters (more obnoxious)
-or-
Do I go with the 400 series Flowmasters (throaty but less obnoxious)

Second:

I think I am going to have my pipes exit under the RS backup lights but I'd like to hear your opinions on that with some pictures if you can. The other part of this is whether I am going to have straight cut chrome tips exiting straight out or if I will have them angled down for some more reverberation.

Bonus Question:

The exhaust guy said that an H pipe would not help performance at all but would only equalize or tune the sound coming from both pipes in the event of some bad firing on the right or left side of the block. Other than that he said there is no other advantage. What do you think? I'm leaning towards not getting the H pipe so I can detect bad firing on one side or the other by sound. I guess the only positive thing I can think of otherwise for an H pipe would be better stabilization of the pipes close to the header joints to prevent leakage. Ho Hum...

Thanks a bunch and I will post pix when we are ready in the second or thrid week in Jan '06.

Thanks

Tom
San Diego, CA
67 Camaro RS Clone
Blue w/white Z28 stripes

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post #2 of 3 (permalink) Old Dec 16th, 05, 10:21 AM
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Dave
 
Join Date: Oct 2005
Location: Rhode Island
Posts: 1,356
Re: Flowmaster 300 Series Vs 400 Series

Personally, I would do X-pipe, that's what I run. It's got a little bit smoother tone to it.

RE: Flowmasters, I've had three different Flowmaster setups on my '68 w/454, using Hooker Super Comp 2" headers into 3.5" Spintech x-pipe, then reducing into 2.5" mufflers.

My first set was American Thunder 40 series system, with tailpipes exiting right behind rear wheels. Way too loud, so I went to full tail pipes. Still loud, but better. Interior resonance was awful in both setups. Finally I tried their longer three-chamber 50 series Deltaflow, which did reduce interior resonance some, but not much. Exterior sound was great, but inside was just too much. I have taken the Flowmasters off and have some new Magnaflows to install, hopefully they will drop the interior resonance level to a minimum.

Flowmaster tech explained to me how the sound waves bounce off the baffles and then back up into exhaust system, creating "resonance" at certain rpm's. Apparently no amount of soundproofing will inhibit those sound waves from reaching interior. Seems to be a function of exhaust size and pipe length. I ride in a buddy's '69 396 Camaro and he runs 40 series Flowmasters with very acceptable interior resonance levels, probably because he has smaller headers and exhaust pipes.

My advice, maybe you'll get lucky on first shot, but be prepared to experiment with mufflers to satisfy your own personal taste in noise levels, both in and out of car. I would use some easy-disconnect clamps and make sure you're real happy with everything prior to welding the whole system in place.

Dave F. in Rhode Island
'68 Camaro SS Accel DFI 454 (SOLD - I'm a boring Corvette owner now)
Bought my first big-block Chevy in 1970
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post #3 of 3 (permalink) Old Dec 19th, 05, 03:04 PM Thread Starter
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Tom
 
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Talking Re: Flowmaster 300 Series Vs 400 Series

Cool, thanks for the input. I'm currently running a 327 210 HP but will be pushing it up to about 350 HP by this next summer with some upgrades. The 400 Series might be the right thing for me now but I would like to hear about your Magnaflow experience when you get them in.

I have until the first week in Jan to make my choice.

Thanks

Thanks

Tom
San Diego, CA
67 Camaro RS Clone
Blue w/white Z28 stripes

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