This ride belongs to The Nguyen Brothers. The little Nguyen with
a clean SC400 and bigger Nguyen with a 2JZGTE Swap with 6 Speed. One
day the bigger Nguyen wanted more power and sound and decided to do some
muffler modifications. Initially, Tony Wanted to do dual 2.5"
straight from header on. I advised him that this modification will
be noise and loose some lower end power. So, we decided to delete
the center cat and the restrictive Y pipe with a 3" straight pipe.
Besides the 3" Y-pipe, Tony also have a set of Greddy Muffler for the
SC300. The Greddy Mufflers are 2.5". Here is how the stock
SC400 exhaust system looks like:
The U.S. Spec Soarer has a Sub-Catalytic Converter and its very restrictive. Since I had dual 3" exhaust and it was LOUD and its a pain sometime for a luxury car. Here are some pictures of before and after Greddy Muffler installation:
From our phone conversation, Tony stated this setup have slightly deeper
tone, but the sound level is almost like stock. However, Tony
stated there is definitely an improvement in performance. This is
a very classy N/A upgrade for the Lexus SC400. This setup retained
stock exhaust noise level and improve full band of power. Great
job Tony and Great choice of exhaust. Thanks. How about some
sound files and dyno numbers? Here are few words from Tony: "
Exhaust used: Catback
Greddy MX exhaust for SC300. The midcat was removed and replaced
with Greddy MX piping back to the dual exhaust w/ Greddy resonators.
Custom 3" pipe (I think) was made to convert the two 2.25" pipes to one.
Sound is very very stock like but with more aggressive tone when stepped
on. Nice deep growl at idle. After the job, responsiveness seemed
to improved throughout acceleration both low end & top end. Very smooth,
I can feel the difference now how the stock pipes were restrictive.
I would recommend this setup, although it's kind of hard to find, to
anyone looking to put an exhaust on their SC300/SC400. I've been meaning
to record a video clip with sound of the exhaust too, I'll host it for
you. Feel free to put in more stuff"
Here is the SC400 With Y-Pipe Sound Clip