should i de-cat? or just keep it and replace the muffler instead coz some say its more than enough if ur ride is lightly modded (good airfilter, spark plug, sport springs etc) and u really concern about fuel consumption but enjoy some additional power in low-mid end rpm and mainly do city driving with medium heavy traffic.i was already on my way to de-cat till someone mentioned dont de-cat to maintain backpressure coz without it auto car will suffer so replace muffler only. so now...
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