Originally Posted by 1QuikWS6
Be careful removing all the restrictions and opening up exhaust size (greatly reducing factory built-in backpressure) - on the NA cars it actually has a detrimental effect and you LOSE low end power.
Cars were designed to run in optimum condition with a certain amount of backpressure.
Do a Search on here and do some reading 1st...
ive done 20 searches. no solid answers on this, hence the question.