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green71's Avatar
 
Join Date: May 2001
Location: Boise, ID USA
Posts: 211
Valence/Bursch exhaust question

Hi all,

After the exhaust tip rusted off of the muffler of my '71 1.7l, I replaced it with a second-hand Bursch. I like the sound & it seemed to perk up the performance a bit, but now my valence doesn't fit. The exhaust tip is a few inches inboard of the hole in the valence. Coupla questions:

1. Did I buy a BX1413 for late-style valence instead of a BX1403 for early-style valence?

2. Will a later valence fit my car w/o modifications to correct the misfit?

3. The Bursch makes a brief, gravely, almost rattly noise when dropping out of high RPMs. (I.e. rev the engine over 4k & let it drop back down to idle. Sounds a bit like a can full of coins.) Is this normal, or is this second-hand Bursch no good?

Any input would be appreciated!

Thanks,

Mark
Old 04-04-2002, 07:38 PM
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kellzey's Avatar
 
Join Date: Jun 2001
Location: Central Florida
Posts: 1,409
I had a Bursch on my 1974 1.8L with the standard rear valance and it fit perfectly. I suspect you have the wrong Bursch for your valance.

My Bursch had a rattly sound on deceleration. It was worse when I first installed it (i reused the same muffler gaskets). When I reinstalled with new gaskets it decreased significantly, but still rattled a bit. I think it's just characteristic of some of the mufflers.

I had stock L-jet, with a K&N filter, pertronix ignitor, and a bursch muffler. Probably added a total of about 7 or so horsepower, but it seemed to run stronger.

Regards,

Karl Ellzey
914-less
2001 Boxster
Old 04-04-2002, 08:02 PM
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rfoulds's Avatar
 
Join Date: Aug 2001
Location: La Quinta, Ca
Posts: 465
Garage
Coupla things.

Yes, the valance can be changed to late style without further modification.

Use new metal gaskets purchased from PP, not paper ones.

Use correct exhaust nuts and bolts that won't rust or heat-expand.

Check your muffler bracket that hangs from the back of the tranny. Lots of rattles come along when that bracket is broken. And its almost always broken.

If it don't fit, take the Bursch off and "modify it", using a five pound hammer. I bent mine a good 3 inches to get it through the notch in the valance. But take it off and do it on the bench, don't wack it while its on the car, you will brak something.
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Randy Foulds, La Quinta, CA
1974 914 Oly Blue with 24k miles! SOLD
1997 Boxster Spec 2.5, SOLD 1970 914-6 SOLD, 1974 914-4 ...SOLD 1974 914-4 slant nose SOLD
Old 04-05-2002, 05:40 AM
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Join Date: Dec 1969
Location: Lompoc, Ca. 93436
Posts: 178
I took mine to my local muffler shop. They hacked off the stock pipe and welded a new larger tailpipe, looks much better, fits thru my vlaence, and I'm sure the larger pipe was worth 1/2 horsepower. http://pelicanparts.com/swapmeet_pics/GermanAutoFest-01/Pic458.jpg
Here is a picture

Bee Jay
Old 04-05-2002, 06:00 AM
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green71's Avatar
 
Join Date: May 2001
Location: Boise, ID USA
Posts: 211
Thanks for all the help. I just had a local muffler shop extend the tail pipe per Bee Jay's suggestion. Seems to work just fine.

Mark
Old 04-06-2002, 10:51 AM
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