shorty headers
04-17-2008, 10:06 PM
#21
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The comparison photo shows the stock manifold heat shield. the actual manifold is much smaller, maybe 1.5" I wanted stock quality fit so I installed 1.75' BBk shorties and random tech Y with super High flow cats to my Hooker cat-back. The headers and y flow much better. The car sounds stock at idle and low rpm, above 2k rpm it's deep and loud enough to draw attention without being obnoxious. I didn't have a single issue with fit or leaks. I also installed an LS6 intake manifold. The car runs great without a tune but this summer I'll get a tune to maximize my gains.
07-25-2011, 09:29 AM
#22
07-25-2011, 05:46 PM
#24
Please do tell me WHICH counties are smog exempt??? This will be news to me that I would very much appreciate big time. I ended up shipping a car out of state because I could not smog it legally.
07-25-2011, 06:21 PM
#27
Lake County north of San Fran is the same way. Smog once then never again. The smog test here doesn't include the treadmill either. Just the old school tailpipe check.
07-27-2011, 09:58 AM
#30
07-27-2011, 10:45 AM
#31
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07-27-2011, 10:46 AM
#32
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might be a noob question but, what about shorties with a cutout? would you see some significant change in hp #'s that come close to having longtubes?
07-28-2011, 05:57 PM
#36
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The car got louder, and feels as strong as before. I use a SLP Y which
I had bought, swapped off and saved, and put back. It has a much
cleaner merge than the Jet-Hots. Great long tubes and a crappy
merge can easily be worse than a good shorty based plumbing
lineup. And a stock muffler could defeat them both. And not all
long tubes are equal either.
Whatever restriction is left in the exhaust is not the JBAs' fault; they
flowed enough to blow an O2 sensor out of the hole on the Mufflex
tubes downstream (also used, with worn threads).
Beware of the ones you see on eBay, there are some truly crappy
ones going for about $99 that have bad collector designs (like a
1/2" sharp edge at the flange, turbulence galore). The JBAs have
a nice collector with even a baby velocity spike, and everything is
smooth. BBKs are pretty, I haven't ever looked at the innards.
M6 guys will benefit from the midrange torque build-out from the
resonant scavenging, some. Guys with an A4 and a high stall speed
just don't spend any time in the mid RPM range at high pedal. So
all I need is as little backpressure as can get past the sheriff.
I had bought, swapped off and saved, and put back. It has a much
cleaner merge than the Jet-Hots. Great long tubes and a crappy
merge can easily be worse than a good shorty based plumbing
lineup. And a stock muffler could defeat them both. And not all
long tubes are equal either.
Whatever restriction is left in the exhaust is not the JBAs' fault; they
flowed enough to blow an O2 sensor out of the hole on the Mufflex
tubes downstream (also used, with worn threads).
Beware of the ones you see on eBay, there are some truly crappy
ones going for about $99 that have bad collector designs (like a
1/2" sharp edge at the flange, turbulence galore). The JBAs have
a nice collector with even a baby velocity spike, and everything is
smooth. BBKs are pretty, I haven't ever looked at the innards.
M6 guys will benefit from the midrange torque build-out from the
resonant scavenging, some. Guys with an A4 and a high stall speed
just don't spend any time in the mid RPM range at high pedal. So
all I need is as little backpressure as can get past the sheriff.
