Bolt On 240sx
NKOTB
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The only thing it would be bad for is everyone on this planet's ears b/c it will sound like shit and annoy everyone. Please use a muffler. If you lose 1hp, its ok.
Mandrel bending is when a type of insert is used in the pipe to limit wrinkling and maintain even ID during the bending process. In crush bending, the metal wrinkles and the ID of the piping is reduced.