SSI only because they have heat exchangers and a M&K 2 in 1 out, check out a sound clip I made while some track touring .....it has whats been called the old school sound, with a change of note at 5500 thats great. Living in so florida I put Bursch headers (no heat) and said M&K but you'd prob want to stick with headers with heat, I know SSIs not sure of others,
https://youtu.be/3KiPOUTGvdk
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87 911 coupe, GP white, cashmere/black
64 Alfa Romeo Giulia TI - the violin
89 Peugeot 505 Turbowagon-other Pcar
67 912 coupe, white, sold
04 Audi Allroad 2.7T
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