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07-01-2002, 02:35 PM
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Scooby Newbie
Member#: 8314
Join Date: Jul 2001
Location: Riverside, California
Vehicle:2002 Impreza WRX Dirt Over Silver |
Attn. Turbo Gurus - UP Q (New)
I have heard that the factory STi uppipes w/o a cat have a liner that is tapered and that this taper is designed to control boost spikes. Can I get some confirmation on this?
Is the USDM uppipe also tapered or does the catalyst perform the same job for us as the taper does for the STi? Thanks.
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