From digest.v7.n1124 Thu Feb 12 16:15:42 1998
From: "Edwards, Scott" <Scott.Edwards_at_Compaq.com>
Date: Thu, 12 Feb 1998 10:59:32 -0600
Subject: <E28> Borla Exhaust Experience
I received my new Borla stainless steel exhaust last week and got it
installed over the weekend. I wanted to pass along my experience.
- After I ordered it, I was informed that it would have to be built
since they were out of stock. Not surprising since it's for my '84
533i (same model as the 633). I took delivery about 4 weeks after
placing the order from a local sport shop for $510.
- The new system was shipped in two parts, the muffler and the pipes
(replacing the resonator) which bolt together with stainless clamps.
It has the intercooled tips which are highly polished, although they
stick quite a bit farther than my previous Bosal system. The new tips
are just within the rear bumper. I looked through the muffler and was
surprised to be looking all the way through the muffler. It has a
straight pipe running through the muffler with perforations in the
pipe within the muffler.
- The installation was fairly straightforward, although not as smooth
as I would have liked.
Finish = A The weld and other manufacturing details were very good.
I also like the fact that it's not mirror polished like some others.
Fit = C I was a little concerned when I heard they were going to have
to build my exhaust and who knows how old the jig is. The welded on
plate that butts up to plate on the cat was welded slightly off
requiring me to use several screwdrivers to twist it around slightly
to get the bolts in. Also, once the entire exhaust was in place the
two hangers (near the original resonator) were both pushed to the
right side of the car. The pipes were not bent properly to make the
exhaust run straight down the car. It's tolerable, and nothing rubs,
so I'm living with it. The new hangers I used in my infinite wisdom
were much more flexible and easily accommodated the new setup.
Sound = A- I never dreamed an E28 could sound like that! The only
reason I give it an A- is that it might be a little too loud :-)
Performance = ? The engine definitly breathes more freely and revs
quicker now. I'm only quessing at some of these assumptions, but here
they are. I feel like I have less torque now, based on how much the
engine seems to pull under hard acceleration, but at the same time,
where the engine used to "lug" (i.e. 4th gear at 2K rpm) it now runs
and pulls effortlessly. This is further confused by the fact that I
have a 535 engine with 533 electronics and exhaust, which is smaller
than the 535 exhaust. I also notice that I "seem" to be at speed
quicker than I used to be and I seem to be driving faster now.
Overall, I'm quite pleased and would recommend this exhaust.
Currently they only make it for the 533 model in the E28 family. The
533 used 42mm pipes and the 535 bumped up to 45mm, cat back. Based on
the age of the cars, I wouldn't expect that they would build one
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